HELP! P010100 - Mass or Volume Air Flow Sensor "A" Circuit Range/Performance issue

[NicolasH]

I'm having an issue with our 2016 T6 T28 102 camper van (87k). We went away just after Easter and the EML light came on. Using Carista I found these faults:

P010100 - Mass or Volume Air Flow Sensor "A" Circuit Range/Performance.
U100800 - Data Bus On Board Diagnostic Interface: Check DTC memory.

I reset the faults and carried on, but the van felt sluggish and the MPG was around 29MPG - it is usually late 30's.

Since returning, I have replaced the Mass Air Flow Sensor with an identical Bosch unit and the air filter (the original wasn't too dirty but I replaced it with a Bosch).
The van now drives as expected and the MPG has improved. The EML is off but I'm still getting the two fault codes (I did reset these after replacing the MAF.

This is what Carista is reporting:

P010100 - Mass or Volume Air Flow Sensor "A" Circuit Range/Performance

Freeze frame :
Priority: 2
Malfunction frequency counter: 1
Unlearning counter: 255
Odometer reading: 87807.8 miles
Engine rpm: 1997.5 RPM
Normed load value: 0 %
Vehicle speed: 53.4 mph
Coolant temperature: 91 °C
Intake air temperature: 27 °C
Ambient air pressure: 14.65 PSI
Voltage terminal 30: 13.98 V

U100800 - Data Bus On Board Diagnostic Interface: Check DTC memory

Freeze frame :
Priority: 2
Malfunction frequency counter: 1
Unlearning counter: 255
Odometer reading: 87802.2 miles
Engine rpm: 1795 RPM
Normed load value: 59.2 %
Vehicle speed: 7.5 mph
Coolant temperature: 16 °C
Intake air temperature: 14 °C
Ambient air pressure: 14.65 PSI
Voltage terminal 30: 14.02 V

Can anyone help and advise what I should do next?

FYI, the van isn't a daily driver and we only use it to go away in, or at the weekends.

Thanks.

Nick

 

[NicolasH]

Bump, for the evening crowd. Any help would be very much appreciated.

 

[mmi]

Would be helpful to know exactly which engine - the engine code on configuration sticker under dash by steering column.

Meanwhile for an engine 102 without AdBlue

Thread 'Had EML this morning and code p0101 Intercooler FUBAR'

19 Apr 2023

Had a quick butchers and I'd say this is pretty conclusive.



So looks like new intercooler time.

Couple of questions.

Does the front grill just clip out once the top trip clips are removed or is it a full bumper off job?

Is it a simple job to change to cooler out. By that I mean a couple of bolts and undo the hoses, are there any nasty surprises like having to remove things to actually get it out?

2016 T6 102hp.

• 109LWB
• Replies: 2
• Forum: Engine, Gearbox, Exhaust, Drivetrain

 

[NicolasH]

Would be helpful to know exactly which engine - the engine code on configuration sticker under dash by steering column.

Meanwhile for an engine 102 without AdBlue

Thread 'Had EML this morning and code p0101 Intercooler FUBAR'

19 Apr 2023

Had a quick butchers and I'd say this is pretty conclusive.



So looks like new intercooler time.

Couple of questions.

Does the front grill just clip out once the top trip clips are removed or is it a full bumper off job?

Is it a simple job to change to cooler out. By that I mean a couple of bolts and undo the hoses, are there any nasty surprises like having to remove things to actually get it out?

2016 T6 102hp.

• 109LWB
• Replies: 2
• Forum: Engine, Gearbox, Exhaust, Drivetrain

Thanks for replying @mmi The engine is a Euro 5, CAAB 75KW

 

[NicolasH]

@mmi I've just checked and I think my intercooler is leaking oil as well. Would that cause the P010100 error?

 

[mmi]

@mmi I've just checked and I think my intercooler is leaking oil as well. Would that cause the P010100 error?

Yes, most likely.
The fault code explanation is actually

P0101 00 - Mass Air Flow Sensor (G70) - Implausible Signal​

thus air flow seen by sensor deviates iwhat ECU is expecting - because of air leak

my intercooler is leaking oil as well.

The oil seen is residual from crankcase ventilation. The crankcase is vented into turbo input and therefrom into intercooler along pressurised air. It's normal, and actually very small amount of oil. The oil just leaves stains, the leaking air doesn't.

 

[NicolasH]

Yes, most likely.
The fault code explanation is actually

P0101 00 - Mass Air Flow Sensor (G70) - Implausible Signal​

thus air flow seen by sensor deviates iwhat ECU is expecting - because of air leak


The oil seen is residual from crankcase ventilation. The crankcase is vented into turbo input and therefrom into intercooler along pressurised air. It's normal, and actually very small amount of oil. The oil just leaves stains, the leaking air doesn't.

Thank you so much. I really appreciate your expertise.

Do you, or anyone else, know if it is straightforward to change the intercooler? I’ve taken the bumper off a couple of times before to fit THQ LED headlights.

 

[mmi]

Perhaps some help here -

Post in thread 'Engine start up'

26 Feb 2022

Hi all, I am recently experiencing the same whooshing noise described on my 2016 140 euro5. We are currently away in the van so I have been frantically trying to find the issue or get VW to look at it, to no avail!

I can hear a loud rushing/whooshing noise on acceleration in any gear which I think is when turbo is under load, starting circa 2000 rpm. It dies out then until you’re into next gear. you don’t hear it when rev up to the 2500 in neutral probably as no load.

I had this on an old Suburu outback which was split turbo hose so I assumed likely the same.
But, I can’t find...

• cy294

• 

Post in thread 'EML mass air flow fault 04795 [Resolved]'

14 Nov 2021

Ok will try looking there first at hoses what do you mean on charge air cooler ? Sorry

Here are the charge air system pipelines of CAAC engine. Charge air cooler is #1.

Source (picture: 145-085):

IFI CP2 Message

Part number for Charge air cooler is 7E0 145 804 B

• mmi

• 

 

[NicolasH]

Perhaps some help here -

Post in thread 'Engine start up'

26 Feb 2022

Hi all, I am recently experiencing the same whooshing noise described on my 2016 140 euro5. We are currently away in the van so I have been frantically trying to find the issue or get VW to look at it, to no avail!

I can hear a loud rushing/whooshing noise on acceleration in any gear which I think is when turbo is under load, starting circa 2000 rpm. It dies out then until you’re into next gear. you don’t hear it when rev up to the 2500 in neutral probably as no load.

I had this on an old Suburu outback which was split turbo hose so I assumed likely the same.
But, I can’t find...

• cy294

• 

Post in thread 'EML mass air flow fault 04795 [Resolved]'

14 Nov 2021

Ok will try looking there first at hoses what do you mean on charge air cooler ? Sorry

Here are the charge air system pipelines of CAAC engine. Charge air cooler is #1.

Source (picture: 145-085):

IFI CP2 Message

Part number for Charge air cooler is 7E0 145 804 B

• mmi

• 

That's a great start - thank you.

 

[Extol]

If you could do a smoke test at the air filter, all the way to the inlet manifold, you could pin point any boost pressure leaks.
just a thought.