NOx sensor and Adblue faults codes

[Greybeard]

Hi @mmi

Well, thank you for the steep, but guided learning curve!

I haven’t yet though managed to find the ‘Live’ readings including speed at fault as on your fault log printout.
Luckily my joyride included around a town bypass, to the roundabout at the end and back the same route.
So, I plotted the route on Google maps and, at the point of fault, I would have been travelling at around 95km, accelerating up a slight incline.
Hope this helps.

That is the only trip I’ve made in the Bus since returning from Yorkshire.

The last regen is listed as 151 minutes and 183km old, with diesel consumption of 13.36 litres.
This would have been returning home on the M5 motorway @ 70mph.

I will carry on playing with OBDeleven to hopefully learn more.

It’s been fun!
Andy

 

[Miguelpfdez94]

Hi guys,

I hope all is well.

I have had the error below four times with the corresponding MIL light. T6 Multivan 2016 DSG 150hp mapped to 180hp


Last time was yesterday, after replacing the NOx sensor (which i thought it solved the issue because i have done more than 1500 kms with the new sensor). Also, the van has (after the second light) gone through after a descarbonization proccess which is supposed to clean EGR, turbo, DPF etc.
EGR flexi pipes (front and rear) aren’t leaking, i have made sure, i have the "newer" version which is not supposed tu crack.

The van has not done a DPF regeneration quite recently as the 95% of the time i drive is highways around 2200-2400rpm long journeys

Error and full autoscan attached below. The autoscan was taken after clear the code (i know you were going to ask for it )

i have been reading similar posts in the forun buy havent been able to find a case similar than mine since the error seems a slightly different

Also, i think i have the most updated software engine, haven`t i?
04L 906 056 KH H02 6184 = the current

The three parameter have come to my atention are these

NOx sensor before SCR cat conv: offset correction factor: 0 ppm
NOx sensor after SCR cat conv: offset correction factor: 341 ppm
Reducing agent quality sensor: urea concentration: 305.92 %


what are your thoughts, what could be the next steps to check? Is there a particulates sensor? another NOx sensor? Catalytic/DPF issue?

Thanks in advanced
Cheers
Miguel

Sunday,19,December,2021,17:06:21:16365
VCDS Version: Release 21.3.0 Running on Windows 10 x64
www.Ross-Tech.com

                Address 01: Engine       Labels: 04L-907-309-V2.clb
Control Module Part Number: 04L 906 056 KH    HW: 04L 907 445
  Component and/or Version: R4 2.0l TDI   H02 6184
           Software Coding: 0025401C433401080000
            Work Shop Code: WSC 02737 790 50316
              ASAM Dataset: EV_ECM20TDI03004L906056KH 004013 (VN75)
                       ROD: EV_ECM20TDI03004L906056KF.rod
                      VCID: 7DA7F9E94D729033E45-8028
2 Faults Found

31103 - SCR NOx Catalyst Bank 1
          P20EE 00 [175] - Efficiency too Low
          MIL ON - Confirmed - Tested Since Memory Clear
             Freeze Frame
                    Fault Status: 00000001
                    Fault Priority: 2
                    Fault Frequency: 1
                    Mileage: 195922 km
                    Date: 2063.01.25
                    Time: 17:06:14

                    Engine RPM: 2199.00 /min
                    Normed load value: 43.5 %
                    Vehicle speed: 122 km/h
                    Coolant temperature: 90 °C
                    Intake air temperature: 15 °C
                    Ambient air pressure: 950 mbar
                    Voltage terminal 30: 14.687 V
                    Unlearning counter according OBD: 40
                    Air mass at air mass meter 1: 198.0 kg/h
                    Outside temperature sensor 1: B1: raw value: 14.5 °C
                    Mass airflow sensor 1 bank 1 airflow: raw value: 755.3 mg/stroke
                    Throttl.valve adapt. 1 bank 1: posit feedback - Actual value: 58.98 %
                    NOx sensor before SCR cat conv: offset correction factor: 0 ppm
                    NOx sensor after SCR cat conv: offset correction factor: 160 ppm
                    Reducing agent quality sensor: urea concentration: 305.92 %
                    Reducing agent quality sensor: raw temperature value: 0.0 °C

27277 - System Voltage
          P0562 00 [039] - Too Low
          Not Confirmed - Tested Since Memory Clear
             Freeze Frame
                    Fault Status: 00000001
                    Fault Priority: 2
                    Fault Frequency: 2
                    Mileage: 0 km
                    Date: 2000.01.00
                    Time: 00:00:00

                    Engine RPM: 0.00 /min
                    Normed load value: 0.0 %
                    Vehicle speed: 0 km/h
                    Coolant temperature: 22 °C
                    Intake air temperature: 14 °C
                    Ambient air pressure: 930 mbar
                    Voltage terminal 30: 12.390 V
                    Unlearning counter according OBD: 40
                    Air mass at air mass meter 1: 0.0 kg/h
                    Standardized air flow ratio: 1.000 counts
                    Exhaust recirc.valve 1 bank 1: posit.feedback - Actual value: 1.17 %
                    Throttl.valve adapt. 1 bank 1: posit feedback - Actual value: 0.00 %
                    Charge air pressure: specified value: 0.000 bar
                    Absolute intake pressure: 93 kPa abs
                    Mean injection quantity: 0 mg/stroke
                    Index of current engine mode: 8
                    Index of next requested engine mode: 8
                    Index of engine target mode: 8


Readiness: N/A

Friday,24,December,2021,16:49:10:16365
VCDS Version: Release 21.3.0 Running on Windows 10 x64
www.Ross-Tech.com

                Address 01: Engine       Labels: 04L-907-309-V2.clb
Control Module Part Number: 04L 906 056 KH    HW: 04L 907 445
  Component and/or Version: R4 2.0l TDI   H02 6184
           Software Coding: 0025401C433401080000
            Work Shop Code: WSC 02737 790 50316
              ASAM Dataset: EV_ECM20TDI03004L906056KH 004013 (VN75)
                       ROD: EV_ECM20TDI03004L906056KF.rod
                      VCID: 7DA7F9E94D729033E45-8028
1 Fault Found

31103 - SCR NOx Catalyst Bank 1
          P20EE 00 [175] - Efficiency too Low
          MIL ON - Confirmed - Tested Since Memory Clear
             Freeze Frame
                    Fault Status: 00000001
                    Fault Priority: 2
                    Fault Frequency: 1
                    Mileage: 196323 km
                    Date: 2063.01.28
                    Time: 19:46:39

                    Engine RPM: 2213.00 /min
                    Normed load value: 45.5 %
                    Vehicle speed: 123 km/h
                    Coolant temperature: 90 °C
                    Intake air temperature: 13 °C
                    Ambient air pressure: 930 mbar
                    Voltage terminal 30: 13.140 V
                    Unlearning counter according OBD: 40
                    Air mass at air mass meter 1: 212.4 kg/h
                    Outside temperature sensor 1: B1: raw value: 12.0 °C
                    Mass airflow sensor 1 bank 1 airflow: raw value: 805.5 mg/stroke
                    Throttl.valve adapt. 1 bank 1: posit feedback - Actual value: 60.53 %
                    NOx sensor before SCR cat conv: offset correction factor: 0 ppm
                    NOx sensor after SCR cat conv: offset correction factor: 178 ppm
                    Reducing agent quality sensor: urea concentration: 305.92 %
                    Reducing agent quality sensor: raw temperature value: 0.0 °C


Readiness: N/A


Sunday,16,January,2022,20:57:45:16365
VCDS Version: Release 21.3.0 Running on Windows 10 x64
www.Ross-Tech.com

                Address 01: Engine       Labels: 04L-907-309-V2.clb
Control Module Part Number: 04L 906 056 KH    HW: 04L 907 445
  Component and/or Version: R4 2.0l TDI   H02 6184
           Software Coding: 0025401C433401080000
            Work Shop Code: WSC 02737 790 50316
              ASAM Dataset: EV_ECM20TDI03004L906056KH 004013 (VN75)
                       ROD: EV_ECM20TDI03004L906056KF.rod
                      VCID: 7DA7F9E94D729033E45-8028
1 Fault Found

31103 - SCR NOx Catalyst Bank 1
          P20EE 00 [175] - Efficiency too Low
          MIL ON - Confirmed - Tested Since Memory Clear
             Freeze Frame
                    Fault Status: 00000001
                    Fault Priority: 2
                    Fault Frequency: 1
                    Mileage: 198457 km
                    Date: 2064.01.19
                    Time: 16:52:08

                    Engine RPM: 1811.50 /min
                    Normed load value: 25.9 %
                    Vehicle speed: 100 km/h
                    Coolant temperature: 90 °C
                    Intake air temperature: 9 °C
                    Ambient air pressure: 940 mbar
                    Voltage terminal 30: 13.195 V
                    Unlearning counter according OBD: 40
                    Air mass at air mass meter 1: 100.8 kg/h
                    Outside temperature sensor 1: B1: raw value: 8.5 °C
                    Mass airflow sensor 1 bank 1 airflow: raw value: 473.5 mg/stroke
                    Throttl.valve adapt. 1 bank 1: posit feedback - Actual value: 75.41 %
                    NOx sensor before SCR cat conv: offset correction factor: 0 ppm
                    NOx sensor after SCR cat conv: offset correction factor: 341 ppm
                    Reducing agent quality sensor: urea concentration: 305.92 %
                    Reducing agent quality sensor: raw temperature value: 0.0 °C


Readiness: N/A

Wednesday,08,December,2021,10:49:02:16365
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 21.3.0.0  HEX-V2 CB: 0.4545.4
Data version: 20210226 DS325.0
www.Ross-Tech.com


VIN: WV2ZZZ7HZGH141107   License Plate:


Chassis Type: 7H-VN75 (7E0)
Scan: 01 02 03 04 08 09 10 15 17 18 19 25 5F 61 69 0B

VIN: WV2ZZZ7HZGH141107   Mileage: 195490km-121471miles

01-Engine -- Status: OK 0000
02-Auto Trans -- Status: OK 0000
03-ABS Brakes -- Status: OK 0000
04-Steering Angle -- Status: OK 0000
08-Auto HVAC -- Status: OK 0000
09-Cent. Elect. -- Status: OK 0000
10-Park/Steer Assist -- Status: OK 0000
15-Airbags -- Status: OK 0000
17-Instruments -- Status: OK 0000
18-Aux. Heat -- Status: Malfunction 0010
19-CAN Gateway -- Status: OK 0000
25-Immobilizer -- Status: OK 0000
5F-Information Electr. -- Status: Malfunction 0010
61-Battery Regul. -- Status: OK 0000
69-Trailer -- Status: OK 0000
-------------------------------------------------------------------------------
Address 01: Engine (2D2D2-CXFA)       Labels:. 04L-907-309-V2.clb
   Part No SW: 04L 906 056 KH    HW: 04L 907 445
   Component: R4 2.0l TDI   H02 6184 
   Revision: 23002001   
   Coding: 0025401C433401080000
   Shop #: WSC 02737 790 50316
   ASAM Dataset: EV_ECM20TDI03004L906056KH 004013
   ROD: EV_ECM20TDI03004L906056KF.rod
   VCID: 7DA7F9E94D729033E45-8028

No fault code found.
Readiness: N/A

-------------------------------------------------------------------------------
Address 02: Auto Trans (J743)       Labels:. 0BH-927-711.clb
   Part No SW: 0BT 300 046 A    HW: 0BH 927 711 G
   Component: DSG DQ500-7F  H11 5206 
   Revision: 00H11V01   
   Coding: 0014
   Shop #: WSC 00000 000 00000
   ASAM Dataset: EV_TCMDQ500021 001001
   ROD: EV_TCMDQ500021_VN75.rod
   VCID: 34311CCD3EB8917B5BB-8060

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes (J104)       Labels: 7E0-907-37x-MK100ESC.clb
   Part No SW: 7E0 907 379 P    HW: 7E0 907 379 M
   Component: ESC           H05 0132 
   Revision: 00000000    Serial number: 41136000001694
   Coding: 307E40982566847F0C760276A48921D3780000
   Shop #: WSC 02739 790 50316
   ASAM Dataset: EV_Brake1ESCCONTIVN75XGP2 011001
   ROD: EV_Brake1ESCCONTIVN75XGP2_011.rod
   VCID: 3FDB43E107FE4223B69-806A

No fault code found.

-------------------------------------------------------------------------------
Address 04: Steering Angle (G085)       Labels:* 6R0-959-654.clb
   Part No SW: 6R0 959 654     HW: 6R0 959 654
   Component: LENKW.SENSOR  H07 0070 
   Serial number: 10021613471240
   Coding: 01
   Shop #: WSC 00000 000 00000
   ASAM Dataset: EV_LWSKLOVW25X 005001
   ROD: EV_LWSKLOVW25X.rod
   VCID: 7EA5FEE540748B2BFDF-802A

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC (J255)       Labels:| 7E5-907-040.clb
   Part No SW: 7E0 907 040 H    HW: 7E0 907 040 H
   Component: ClimatronicT5 H03 0509 
   Revision: 00001K03   
   Coding: 0000001103
   Shop #: WSC 02737 790 50316
   ASAM Dataset: EV_ClimatronicT5 A01003
   ROD: EV_ClimaAutoT5Basis.rod
   VCID: 2809F8BDF270E59BE73-807C

   Slave 1:
   Subsystem 1 - Part No SW: 7E5 907 049 C    HW: 7E5 907 049 C
   Component: Heckbedienung  H11 0303
   Serial number: BHB-0012104160015164

No fault code found.

-------------------------------------------------------------------------------
Address 09: Cent. Elect. (J519)       Labels:. 7E0-937-BCM-V1.clb
   Part No SW: 7E0 937 090     HW: 7E0 937 090
   Component: BCM PQ25 Max4 H80 0736 
   Revision: B9080001    Serial number: 0771 117160389
   Coding: A0A039AA4A61341293284FF47CEB8EDC0F84690F60CC6960320400A30840
   Shop #: WSC 02737 022 88509
   VCID: 6889B8BD3270259B273-803C

   Subsystem 1 - Part No: 5K7 955 559 B  Labels: 5K7-955-559.CLB
   Component: RLS 250416 03  37  0059
   Coding: 0228EE

   Subsystem 2 - Part No SW: 7E0 959 801 J    HW: 7E0 959 801 J  Labels: 7E0-959-80X-V2.CLB
   Component: J386__TSG_FT  003 8657
   Serial number: KU0KU028041661191497
   Coding: 4400A3

   Subsystem 3 - Part No SW: 7E0 959 802 J    HW: 7E0 959 802 J  Labels: 7E0-959-80X-V2.CLB
   Component: J387__TSG_BT  003 8657
   Serial number: KU0KU028041661193987
   Coding: 5500A3

   Subsystem 4 - Part No: 7E1 951 171
   Component: DWA-Sensor 00  001 0104
   Coding: 000000

   Subsystem 5 - Part No: 1K0 951 605 C
   Component: LIN BACKUP HO  H05 1501
   Coding: 000000

   Subsystem 6 - Part No: 7E1 951 171
   Component: DWA-Sensor 00  001 0104
   Coding: 000000

   Subsystem 7 - Part No SW: 7E0 959 442     HW: 7E0 959 442   Labels: 3C8-959-537.CLB
   Component: E221__MFL-DC1  H02 0103
   Serial number: 29160000830150126171
   Coding: B0FFFF

No fault code found.

-------------------------------------------------------------------------------
Address 10: Park/Steer Assist (J446)       Labels:| 7E0-919-475.clb
   Part No SW: 7E0 919 475 S    HW: 7N0 919 475
   Component: PARKHILFE 8K  H06 0210 
   Revision: --------    Serial number: 28261607900437
   Coding: 318109
   Shop #: WSC 02737 790 50316
   ASAM Dataset: EV_VW75XParkAssis8K 001011
   ROD: EV_VW75XParkAssis8K_001_VN75.rod
   VCID: 42DD4A15740C2FCBD97-8016

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags (J234)       Labels:| 5K0-959-655.clb
   Part No SW: 7E0 959 655 H    HW: 7E0 959 655 H
   Component: VW10Airbag00Z H08 0018 
   Revision: --------    Serial number: 003V4000DMTG
   Coding: 00000000000000000000000000000000305A
   Shop #: WSC 02734 790 50316
   ASAM Dataset: EV_AirbaVW10BPAVW12X 001028
   ROD: EV_AirbaVW10BPAVN750_VN75.rod
   VCID: 3B2337F113E65E039A1-806E

   Crash sensor for side airbag: driver side:
   Serial number: 3495ZRB400655AL68H48

   Front Passenger's Side Airbag Crash Sensor:
   Serial number: 3505ZRB400855AL6K1SM

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments (J285)       Labels:| 5K0-920-xxx-17.clb-SRI1
   Part No SW: 7E0 920 870 L    HW: 7E0 920 870 L
   Component: KOMBI         H05 1008 
   Serial number: 00000000000000
   Coding: 170F010400
   Shop #: WSC 02737 790 50316
   ASAM Dataset: EV_Kombi_UDS_VDD_RM09 A05730
   ROD: EV_Kombi_UDS_VDD_RM09_005_VW25.rod
   VCID: 323D1AD5C4AC9F4B497-8066

No fault code found.

-------------------------------------------------------------------------------
Address 18: Aux. Heat (J364)       Labels:| 7E0-963-27X-18.clb
   Part No SW: 7E0 963 273 A    HW: 7E0 963 273 A
   Component: STH-T5GP2     003 0009 
   Coding: 4101
   Shop #: WSC 02737 790 50316
   ASAM Dataset: EV_AuxilParkiHeateWOST5G2 001013
   ROD: EV_AuxilParkiHeateWOST5G2.rod
   VCID: 2B0307B1E386CE830A1-807E

1 Fault Found
0375 - Function Restricted due to Insufficient Voltage
          U1400 00 [008] - -
          [DYSFUNCTION BY UNDERVOLTAGE]
          Intermittent - Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 7
                    Fault Frequency: 2
                    Reset counter: 78
                    Mileage: 194339 km

                    Parking heater: operating condition: OFF
                    71
                    Coolant temperature of parking heater: 0 °C
                    Coolant temperature: -48 °C
                    Engine running status: not detected
                    Fuel level: 14 l
                    Heating performance: 0 W


-------------------------------------------------------------------------------
Address 19: CAN Gateway (J533)       Labels:. 7E0-909-901.clb
   Part No SW: 7E0 909 901     HW: 7E0 937 090
   Component: GW-K-CAN TP20 H80 0736 
   Revision: B9080001   
   Coding: 042207
   Shop #: WSC 02737 022 88509
   VCID: 6889B8BD3270259B273-803C

No fault code found.

-------------------------------------------------------------------------------
Address 25: Immobilizer (J334)       Labels:* Redir Fail!
   Part No SW: 5K0 953 234     HW: 5K0 953 234
   Component: IMMO          H05 1008 
   Serial number:               
   Coding: 000000
   Shop #: WSC 00000 000 00000
   ASAM Dataset: EV_Immo_UDS_VDD_RM09 A03710
   ROD: EV_Immo_UDS_VDD_RM09_VW21.rod
   VCID: 6A8DC2B52CFC178B317-803E

No fault code found.

-------------------------------------------------------------------------------
Address 5F: Information Electr. (J794)       Labels:| 5G0-035-MIB-STD2.clb
   Part No SW: 5C0 035 680 C    HW: 5C0 035 680 C
   Component: MU-S-ND-ER    H22 0245 
   Serial number: VWZAZ2S5068721
   Coding: 06570001FF00000011111101008808031F0100D4002001004F
   Shop #: WSC 02737 790 50316
   ASAM Dataset: EV_MUStd4CTSAT 001022
   ROD: EV_MUStd4CTSAT_VN35.rod
   VCID: 211FE599914A14D3A0D-8074

No fault code found.

-------------------------------------------------------------------------------
Address 61: Battery Regul. (J840)       Labels:. 1K0-907-534.clb
   Part No SW: 7E0 907 534     HW: 7E0 937 090
   Component: Batt.regelung H80 0736 
   Serial number: 0771 117160389
   Coding: 330B1A73
   Shop #: WSC 02739 790 00000
   VCID: 6889B8BD3270259B273-803C

   Subsystem 1 - Part No SW: 7E0 915 181 G    HW: 7E0 915 181 G
   Component: J367-BDM  H08 0223
   Serial number: 63111139491261990993

No fault code found.

-------------------------------------------------------------------------------
Address 69: Trailer (J345)       Labels:. 1K0-907-383-V2.clb
   Part No SW: 1K0 907 383 H    HW: 1K0 907 383 G
   Component: Anhaenger     H12 0130 
   Revision: 3B001001    Serial number: 00000402198056
   Coding: 410D000103000000
   Shop #: WSC 02739 790 00000
   VCID: 323D1AD5C42C9F4B497-8066

No fault code found.

End(Elapsed Time: 01:59, VBatt start/end: 11.8V/11.9V. VIgn 12.0V, udsna)--

 

[mmi]

what are your thoughts, what could be the next steps to check/replace ?

Please post engine's complete blockmap data so we can get an inside view what the engine thinks about itself.
Preferably warm engine idling (e.g. after a 15+ minute drive).

---

If you are interested I'll prepare a measurement setup for VCDS to be used when you drive around - to monitor various NOx related engine parameters.
Let us know what you think!

 

[Miguelpfdez94]

Please post engine's complete blockmap data so we can get an inside view what the engine thinks about itself.
Preferably warm engine idling (e.g. after a 15+ minute drive).

View attachment 142082

Wow @mmi , you are everywhere, like a god . Thanks for you response.

I will do the short drive in an hour, warm the engine and do what you have requested.

If you are interested I'll prepare a measurement setup for VCDS to be used when you drive around - to monitor various NOx related engine parameters.
Let us know what you think!

for sure, it will be wonderful and very useul. Could i use to when doing that coming drive to take the 01 module block map?

Thanks
Miguel

 

[mmi]

Could i use to when doing that coming drive to take the 01 module block map?

Of course

Attached a VCDS preset file NOx.u01 (remove .txt extension so it will be .u01 -file)

It should record the following:

IDE00021 Engine RPM​

IDE00075 Vehicle speed​

IDE00347 Air mass: actual value​

IDE00434 Particle filter: soot mass calculated​

IDE04090 Exhaust temperature bank 1​

IDE04272 Counter for regeneration time of particulate filter​

IDE07738 Charge air cooler inlet: pressure sensor 1 bank 1: raw value​

IDE07744 Particle filter: air pressure sensor 1 bank 1: raw value​

IDE07757 Exhaust recirc.valve 1 bank 1: posit.feedback - Actual value​

IDE09017 NOx sens.dwnstrm.SCR cat conv: NOx conc.​

IDE10817 Lambda value at inlet of particulate filter​

IDE11219 Reducing agent inj. quantity: spec. value​

​

Either use the file NOx.u01 - load the measurement preset file from the selection (red circle) below (Or tick all the above parameters manually)

Below at step 3 after loading the preset file you still need to - Tick "Group UDS requests" - by 7

VCDS Data logging​

1. Ignition ON
2. Read engine faults codes: VCDS > Select > Engine > Fault Codes > Save Codes > Clear Codes > Save Codes
3. Start data logging (Adv. Meas.Values etc.) with the preset file - please do not forget to tick the "Group UDS Requests by 7" (greatly enhances sampling rate)
4. Start the engine
5. Do your driving
6. When finished your journey - let engine idle 1-2 minutes (do not touch throttle or even steering wheel)
7. Stop the logging
8. Read engine faults codes: VCDS > Select > Engine > Fault Codes > Save Codes > Clear Codes > Save Codes

The logfile will be in folder C:\Ross-Tech\VCDS\Logs

 

[Miguelpfdez94]

Hi @mmi

I have taken a couple of blockmaps after a 15min and 30 min drive.

here you have attached.

Of course

Attached a VCDS preset file NOx.u01 (remove .txt extension so it will be .u01 -file)

It should record the following:

IDE00021 Engine RPM​

IDE00075 Vehicle speed​

IDE00347 Air mass: actual value​

IDE00434 Particle filter: soot mass calculated​

IDE04090 Exhaust temperature bank 1​

IDE04272 Counter for regeneration time of particulate filter​

IDE07738 Charge air cooler inlet: pressure sensor 1 bank 1: raw value​

IDE07744 Particle filter: air pressure sensor 1 bank 1: raw value​

IDE07757 Exhaust recirc.valve 1 bank 1: posit.feedback - Actual value​

IDE09017 NOx sens.dwnstrm.SCR cat conv: NOx conc.​

IDE10817 Lambda value at inlet of particulate filter​

IDE11219 Reducing agent inj. quantity: spec. value​

​

Either use the file NOx.u01 - load the measurement preset file from the selection below (Or tick all the above parameters manually)

Below at step 3 after loading the preset file you still need to - Tick "Group UDS requests" - by 7

VCDS Data logging​

1. Ignition ON
2. Read engine faults codes: VCDS > Select > Engine > Fault Codes > Save Codes > Clear Codes > Save Codes
3. Start data logging (Adv. Meas.Values etc.) with the preset file - please do not forget to tick the "Group UDS Requests by 7" (greatly enhances sampling rate)
4. Start the engine
5. Do your driving
6. When finished your journey - let engine idle 1-2 minutes (do not touch throttle or even steering wheel)
7. Stop the logging
8. Read engine faults codes: VCDS > Select > Engine > Fault Codes > Save Codes > Clear Codes > Save Codes

The logfile will be in folder C:\Ross-Tech\VCDS\Logs

I will do it this afternoon and will share the results combining a short trip in motorways and in some conventional roads.


thanks
Miguel

 

[Miguelpfdez94]

Hi mmi,

Here you have the logs following the instructions. i did not expect the MIL light to come up during this log-driving as it took more than 1500 kms to came back since last time. Hopefully this log could give us some clue about what is going on with this disgusting error.

i have put the .csv through a loggin tool, it case it may be useful

TuneZilla Log Viewer

Visualize and share your datalogs with ease using this log viewer for VCDS, COBB, Edge EAS, ScanXL, ME7Logger, BlueDriver, and OBDeleven tools.

log.tunezilla.com

Log #538994

log.tunezilla.com

Thanks mate

 

[mmi]

Hi mmi,

Here you have the logs following the instructions. i did not expect the MIL light to come up during this log-driving as it took more than 1500 kms to came back since last time. Hopefully this log could give us some clue about what is going on with this disgusting error.

Thank you very much. Excellent.

We didn't yet catch what I'm expecting to happen. But already some intriguing data in there. I'll try to find a few minutes time to prepare notes what's fascinates me in there

And, you are right - to make the fault surface the conditions has to unfavourable some time.

I would appreciate if you could keep on logging next 200 kms - I would like to capture a full DPF regeneration - it's the most NOx rich period and a candidate to trigger the fault. However, no spesific driving is needed - just need to catch all rides longer than 10 minutes.

Anyways, do the logging but DO NOT CLEAR THE FAULTS anymore so let the engine accumulate NOx overshoots. Just check the faults - it will manifest itself in the fault memory well before turning on MIL light.

Please post the logs as soon as you have collected those.

 

[mmi]

Wow @mmi , you are everywhere, like a god . Thanks for you response.

My favourite - NOx emissions

Here is an appetizer... passive DPF regeneration actually taking soot level down - @huw169

Guess what happens to NOx levels @Miguelpfdez94 when engine exhaust is almost 800 C

A PDF-copy for better readability attached.

 

[Miguelpfdez94]

Hi mmi,

Appreciatted the amount of time taken in this matter

I would appreciate if you could keep on logging next 200 kms - I would like to capture a full DPF regeneration - it's the most NOx rich period and a candidate to trigger the fault. However, no spesific driving is needed - just need to catch all rides longer than 10 minutes.

Anyways, do the logging but DO NOT CLEAR THE FAULTS anymore so let the engine accumulate NOx overshoots. Just check the faults - it will manifest itself in the fault memory well before turning on MIL light.

Please post the logs as soon as you have collected those.

Yes, i am going to do some drives this week (i dont usually take the van in business days as i work mainly from home) of more than 30 min to see if the error come out.

i wont clear the faults.. it is true i have seen this error quite frequently in the memory but until a month ago didn`t turn on the MIL light. That is what really worries me, what could have changed within a month.

My favourite - NOx emissions

Here is an appetizer... passive DPF regeneration actually taking soot level down - @huw169

Guess what happens to NOx levels @Miguelpfdez94 when engine exhaust is almost 800 C

A PDF-copy for better readability attached.

Amazing analysis mmi. So, if i have understood correctly, the nox levels go extremly up when a regeneration is on going due to the exhaust reaching the target temperature... doesn`t it?

Does it matter if it a passive regeneration (like this a think), an active (engine at 1000rpm) or a planned one (with VCDS for e.g)?

But... following this logic, every time a regeneration is being done, there would be a risk to get this error as the NOx will be way up, right?

Thanks
Miguel

 

[huw169]

Watching with interest.

 

[Miguelpfdez94]

Hi @mmi

find attached another log

Also, after this drive, i had the NOx error, luckily this did not turn on the MIL light, find below

1 Fault Found

31103 - SCR NOx Catalyst Bank 1
          P20EE 00 [101] - Efficiency too Low
          Not Confirmed - Tested Since Memory Clear
             Freeze Frame
                    Fault Status: 00000001
                    Fault Priority: 2
                    Fault Frequency: 1
                    Mileage: 198682 km
                    Date: 2064.01.25
                    Time: 20:13:28

                    Engine RPM: 1920.75 /min
                    Normed load value: 40.8 %
                    Vehicle speed: 106 km/h
                    Coolant temperature: 90 °C
                    Intake air temperature: 10 °C
                    Ambient air pressure: 910 mbar
                    Voltage terminal 30: 14.656 V
                    Unlearning counter according OBD: 40
                    Air mass at air mass meter 1: 151.2 kg/h
                    Outside temperature sensor 1: B1: raw value: 7.0 °C
                    Mass airflow sensor 1 bank 1 airflow: raw value: 659.3 mg/stroke
                    Throttl.valve adapt. 1 bank 1: posit feedback - Actual value: 50.41 %
                    NOx sensor before SCR cat conv: offset correction factor: 0 ppm
                    NOx sensor after SCR cat conv: offset correction factor: 281 ppm
                    Reducing agent quality sensor: urea concentration: 273.92 %
                    Reducing agent quality sensor: raw temperature value: 0.0 °C


Readiness: N/A

Thanks!
Regards
Miguel

 

[mmi]

Hi @mmi

find attached another log

Also, after this drive, i had the NOx error, luckily this did not turn on the MIL light, find below

1 Fault Found

31103 - SCR NOx Catalyst Bank 1
          P20EE 00 [101] - Efficiency too Low
          Not Confirmed - Tested Since Memory Clear
             Freeze Frame
                    Fault Status: 00000001
                    Fault Priority: 2
                    Fault Frequency: 1
                    Mileage: 198682 km
                    Date: 2064.01.25
                    Time: 20:13:28

                    Engine RPM: 1920.75 /min
                    Normed load value: 40.8 %
                    Vehicle speed: 106 km/h
                    Coolant temperature: 90 °C
                    Intake air temperature: 10 °C
                    Ambient air pressure: 910 mbar
                    Voltage terminal 30: 14.656 V
                    Unlearning counter according OBD: 40
                    Air mass at air mass meter 1: 151.2 kg/h
                    Outside temperature sensor 1: B1: raw value: 7.0 °C
                    Mass airflow sensor 1 bank 1 airflow: raw value: 659.3 mg/stroke
                    Throttl.valve adapt. 1 bank 1: posit feedback - Actual value: 50.41 %
                    NOx sensor before SCR cat conv: offset correction factor: 0 ppm
                    NOx sensor after SCR cat conv: offset correction factor: 281 ppm
                    Reducing agent quality sensor: urea concentration: 273.92 %
                    Reducing agent quality sensor: raw temperature value: 0.0 °C


Readiness: N/A

Thanks!
Regards
Miguel

Thank you very much. That's indeed interesting. Is your van's clock in the dash panel in correct time (or actually same time as your computer)? Just trying to syncronize the log and the fault time/Instrument. Actually based on engine rpm and speed - the times seem to match.

Interestingly the AdBlue injection paused for 60 seconds before fault code time stamp - even though NOx sensor reports high values - very strange

Anyways, the next DPF regeneration will start approx. in 40-60 km. Let's see what happens in there! Do not clear faults - just keep eye on "Fault frequency" counter in fault log (now 1).

---

PS. Have you checked if the function "Group UDS requests by 7" works for you. It greatly enhances sampling rate by reading data in blocks (of 7).

 

[Miguelpfdez94]

Hi mmi

Thank you very much. That's indeed interesting. Is your van's clock in the dash panel in correct time (or actually same time as your computer)? Just trying to syncronize the log and the fault time/Instrument. Actually based on engine rpm and speed - the times seem to match.

Yes, the panel clock has the correct time

Interestingly the AdBlue injection paused for 60 seconds before fault code time stamp - even though NOx sensor reports high values - very strange

Interesting, it is supposed tobe active all the time the engine is running or just when the car detects a lot of toxic gases, does it turn on? Maybe... could it be dirty or with ad blue cristalized preventing ad blue to be injested efficiently? i have seen a couple of cases around internet.

Anyways, the next DPF regeneration will start approx. in 40-60 km. Let's see what happens in there! Do not clear faults - just keep eye on "Fault frequency" counter in fault log (now 1).

Sure, i will do a couple of rides on saturdarday, of 50-60 kms, i wont clear the fault and let you know

PS. Have you checked if the function "Group UDS requests by 7" works for you. It greatly enhances sampling rate by reading data in blocks (of 7).

i will check it and enable it in the nex run

my understanding is something is wrong in the exhaust system in the car, doesn it? i guess it is not normal this error to come up despite doesn`t turn on the MIL light

thanks
Miguel

 

[mmi]

Interesting, it is supposed tobe active all the time the engine is running or just when the car detects a lot of toxic gases, does it turn on? Maybe... could it be dirty or with ad blue cristalized preventing ad blue to be injested efficiently? i have seen a couple of cases around internet.

Based on my other measurements this far - the injection is on more or less full time. Certainly it pauses during engine braking (=no fuel injected -> no emissions).

The recorded parameter has designation "Reducing agent inj. quantity: spec. value" which suggests it is "commanded" value, thus doesn't necessarily indicate actual value - there is no sensor to record actual AdBlue flow.

Thank you very for doing and sharing the measurements!

i guess it is not normal this error to come up despite doesn`t turn on the MIL light

Well, a kind of normal - I have logged quite a few (some 30+ incidents) P20EE faults without ever seeing MIL light. My feeling is that the "timeout" is somewhere in range 300-500 km - if the active fault doesn't reoccur in that range it seems to start over accumulating some internal counter. However, each overshoot seems to increment the "Frequency" in fault code.

Re your questions a couple of days ago - they are not forgotten - just gathering data to back up my "statements"

 

[Miguelpfdez94]

ased on my other measurements this far - the injection is on more or less full time. Certainly it pauses during engine braking (=no fuel injected -> no emissions).

The recorded parameter has designation "Reducing agent inj. quantity: spec. value" which suggests it is "commanded" value, thus doesn't necessarily indicate actual value - there is no sensor to record actual AdBlue flow.

Thank you very for doing and sharing the measurements!

that makes 100% sense, so, with that paremeter, we have some kind of idea what is going on with the ad blue injectot but not a fact, understood. It is a pitty that sensor does not exist to provide an accurate measurement.

No need to thank me, just trying to be helpful sharing my data/experience and at the same time trying to solve my issue, which most likely will help solve many other in the forum

Well, a kind of normal - I have logged quite a few (some 30+ incidents) P20EE faults without ever seeing MIL light. My feeling is that the "timeout" is somewhere in range 300-500 km - if the active fault doesn't reoccur in that range it seems to start over accumulating some internal counter. However, each overshoot seems to increment the "Frequency" in fault code.

Yes, that is my understanding too. i have had some months ago an injection problem (coil light --> low rail pressure --> faulty injectors) and the frequency in that case indicated the number of error with same code occured, after a certain number of them, MIL light appears so.. i guess it is the same logic with this error as you say

Re your questions a couple of days ago - they are not forgotten - just gathering data to back up my "statements"

i have already realized you dont miss anything really appreciated your help (here and with the bloody paking heater )

Thanks
Miguel

 

[mmi]

Food for thought...

For comparison a recording from a T6 (150kW/204PS) without the software update - thus prone to P20EE fault. The recording was a long one - 2h18mins.

The load conditions seem to be reasonably similar to yours, see average speeds.

Based on these two recordings (just averaging over full span) first impressions:

• On yours NOx level is 5 times higher (258 vs. 47 ppm) even though it's injecting AdBlue twice as much (58.9 vs. 30.6 mg/s)
• Average EGR valve position (25% vs. 39%) indicates significantly lower exhaust recirculation (NOx!)
• Also the lambda value indicates oxygen rich exhaust gases (EGR!) (3.8 vs. 2.7)

Anyways, looking forward to the next data batch!

 

[Miguelpfdez94]

Hi mmi,

here you have another couple of logs, around 40/45 min ride

Sorry, i forgot to add the UDS block in the first one. I did it in the second (LOG-01-IDE00021_&115)

AS you said, in the first ride, the van did a regeneration(LOG-01-IDE00021_&113), i let it finish, i guess you will see it the logs and it will be interestings.

For the moment, the ECU sticks with the same error as before, no new error of any kind.

 

[Miguelpfdez94]

Hi mmi

Thanks for such detailed analysis

For comparison a recording from a T6 (150kW/204PS) without the software update - thus prone to P20EE fault. The recording was a long one - 2h18mins.

So... with that context, that data is from a van where this system was not optimised yet (old software)

On yours NOx level is 5 times higher (258 vs. 47 ppm) even though it's injecting AdBlue twice as much (58.9 vs. 30.6 mg/s)

This really bothers me, that means adblue system is trying to compensate this high amount of NOx particulates and the fault comes up when adblue is in the limit and can not compensate enough... is this assumption correct?

Average EGR valve position (25% vs. 39%) indicates significantly lower exhaust recirculation (NOx!)

This may be the reason why the sensor detect such amount of nox... if the is not opened enough ( due to too much dirty?) there isnt enough recirculation and NOx needs work harder to compensate even though some times goes beyond the limit.

That makes sense mmi?

Also the lambda value indicates oxygen rich exhaust gases (EGR!) (3.8 vs. 2.7)

I dont really know how to interpret this value... id there is too much oxygen in the exhaust gases.. does it mean the combustion is not efficient? By this statement, do you think the EGR may be faulty?

Thanks
Miguel

 

[mmi]

replacing the NOx sensor (which i thought it solved the issue because i have done more than 1500 kms with the new sensor)

A question if you don't mind - what was done on engine approx. 5000 km ago?

Also, i think i have the most updated software engine, haven`t i?
04L 906 056 KH H02 6184 = the current

Yes, that's current software and the data recording provided verify the updated AdBlue injection scheme is in there... - at least partially.
However,

150hp mapped to 180hp

means that the inside of the software is something else than VW OEM software 04L 906 056 KH - 6184

The three parameter have come to my atention are these

NOx sensor before SCR cat conv: offset correction factor: 0 ppm
NOx sensor after SCR cat conv: offset correction factor: 341 ppm
Reducing agent quality sensor: urea concentration: 305.92 %

I don't know how to take advantage of those.

NOx sensor before SCR cat conv: offset correction factor: 0 ppm - always 0 ppm, because early T6 engines do not have NOx sensor before cat.conv.​

NOx sensor after SCR cat conv: offset correction factor: 341 ppm - is a live parameter - found in my logs values 0...1180 ppm.​

​

Reducing agent quality sensor: urea concentration: 305.92 % - is a live parameter on some T6 engines, a few observations here:​

​

Non-zero concentration​

NOx sensor and Adblue faults codes

I'm starting a new thread to make it easier to search this issue. I recently experienced the following problems with my van. It's a Euro 6 102bhp 2017 model. Basically my mpg started to decrease significantly and my adblue consumption started to go through the roof, for no good reason...

www.t6forum.com

​

Always 0.0% concentration​

NOx sensor and Adblue faults codes

I'm starting a new thread to make it easier to search this issue. I recently experienced the following problems with my van. It's a Euro 6 102bhp 2017 model. Basically my mpg started to decrease significantly and my adblue consumption started to go through the roof, for no good reason...

www.t6forum.com

Is there a particulates sensor? another NOx sensor?

Yes, a particulate sensor exists. Just one NOx sensor - till 2019.

Catalytic/DPF issue?

At first glance into the data nothing wrong with them.


That concludes the first part - I'll get back on your recent post in a minute...