Engine losing power, fault codes P0101 and P0402 [Resolved]

[Hanzs]

My T6 2016 2.0 TDI 150 has an engine issue, so I went to the garage. I was still able to drive, but with far less power.
After turning the engine off and on the problem sometimes stays away for some km's. The garage read out the car got error P0402 excessive flow EGR at first.
First Idea was that EGR would not close properly. That was checked, but EGR works fine.
Later on also P0101 was read out, suggesting a MAF sensor problem.
Now I read it may also have something to do with the DPF sensor? Or??

Thank you for your assistance!

 

[Loz]

Check the intercooler has not split, (look for oil stains on the front of it).

 

[Hanzs]

@Loz: just checked, no signs of leakage there.

 

[Hanzs]

Today I read out the diagnostic codes again and I also see codes 13169 and 25215. Does that help?

 

[Loz]

Mass air flow sensor issue possibly, check the cables going into the connector…

can you get a VCDS scan done and post up the full scan?

 

[kjohnr2001]

Check the intercooler has not split, (look for oil stains on the front of it).

Loz, can this be checked with the front still on the van?

 

[kjohnr2001]

Loz, can this be checked with the front still on the van?

Apologies, 2017 T6

 

[Hanzs]

Thanks for your replies, it turned out the mass air flow sensor was not functioning properly.
Has been replaced, now everything is fine again!

 

[Ra102]

Thanks for your replies, it turned out the mass air flow sensor was not functioning properly.
Has been replaced, now everything is fine again!

Hi! How did you test it? I have same problem after replace Egr

 

[FCV2005]

Hello, what symptoms you had exactly? Mine is starting and stops, changed egr with brand new one and no difference. Should i try change maf?

 

[Hanzs]

Hello, what symptoms you had exactly? Mine is starting and stops, changed egr with brand new one and no difference. Should i try change maf?

It was losing power and went into limp mode. no start/stop, engine kept running. Replacing the MAF sensor fixed the issue in my case.

 

[Jaycrossland30]

Got the same problem replaced maf and map sensor and still the same, can’t see any issue with intercooler either?

 

[AuroraT6]

Got the same problem replaced maf and map sensor and still the same, can’t see any issue with intercooler either?

Did you manage to resolve this?

 

[Hanzs]

Did you manage to resolve this?

Thanks for your replies, it turned out the mass air flow sensor was not functioning properly.
Has been replaced, now everything is fine again!