I had a reoccurring engine light with code p0401 "egr a" flow insufficient and then an second one p20ee SCR nox catalyst efficiency below threshold bank 1. I was having no performance issues, just engine management lights.
Yes, all original bits still on can, egr has been blanked, both bits...
...had my EGR cooler replaced as a gesture of goodwill at VW Preston.
Van Is 4 years 9 months & done 23.5k.
EML light and carista codes P0401, P20EE
Had it flushed under warranty a couple of years ago at Manchester.
Was ringing around for quotes on EGR replacement before reading this thread...
...is exactly as it was from new
Started getting engine warning light in March..got a carista & these codes appeared & disappeared randomly
31103
P20EE
33262
P204F
06720
08216
08217
08338
08208
Low level adblue warning light & was in fact full, went away within 50miles
Finally went into limp...
...only partial) DPF regeneration. This shortened cycle combined with highly elevated NOx levels during DPF regeneration could be a candidate for P20EE fault under certain conditions.
Exact threshold TBC - highest recorded soot calculated was 10.61 grams, which ECU considered as finished DPF...
...engine cold start effects on NOx emissions - possibly addressed by ECU update (see above "Short term stats") - possibly related to infamous P20EE fault code in early days of T6.
In this data the "DPF regeneration" period has been isolated from the data (different journeys than "Normal engine...
...was an official recall.
For N1 class (VIN WV1....) the update was not classified as mandatory but was/will be done if faults (especially P204F, P20EE) show up. So basically the decision is left to service center.
In the paperwork it was mentioned that the update might increase AdBlue...
...reagent
INCORR_REAG
ENG110382-ENG20516
SCR inducem system status-inducement system active
active
I believe they are related. P20EE just indicates too high NOx level in the exhaust, which is a consequence of poorly working NOx reduction system as a whole. Thus a guess would be either the...
...piles of junk to earn a living.
I like many have experienced these issues. My van was in 6 times for a total of 52 days back in 2020 due to the P20EE code. I never had the P0401 code. VW will do a step by step process to basically get away with what they can with this issue. I had a new NOx...
...an EML. Carista showed P0401 fault when I scanned it - its a 102 18 plate PV with 49K on the clock. They looked at the van and diagnosed P20EE fault but software is shown as being up to date (I guess the current software does not eliminate all P20EE faults). The notes sent to me show they...
Bit of an update to the saga garage has done an scr reset forced regen and reflashed ECU EML has come back on with p20ee code and egr insufficient flow within 60 miles but no adblue countdown as yet
After speaking to previous owner he said it had a dpf clean by a proper company a year or two ago
We tested the adblue injector it was atomising but slowly and not much adblue was dosed but we have nothing to compare with if it's normal or not
...expect to see less than 25ppm under these condition (even below 10ppm with the updated ECU software). The above might actually explain the P20EE faults in earlier log.
I believe the NOx sensor works correctly (wake up, live data). Assuming the values reported by sensor are of right...
...I can't say anything definite on these - I believe they relate to recent P204F....
Note the mileage and time in freeze frame on P204F and P20EE are the same...
Re the fault P046C - a proposal about testing "specified value" vs. "actual value" was below
Exhaust...
...at 600 miles. So I filled up the ad blue tank and it only took 8l: I thought it was 13 l tank. I checked the Carista and I got an error code P20EE SCR Nox Catalyst below threshold. So I reset it, Ad Blue still showed 600 mile, the warning was still there but about 70 m miles later jumped to...
Hi guys,
another update... i got the same error a week ago more or less
I have gone underneath the van a disassemble the SCR Adblue injector. Surprisingly, the injector was quite clean, with almost no soot around it nor AdBlue crystalized.... for sure i was expecting to find much more dirt...
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