P0101 & P0102 not clearing

eamonnpetty · Post by **eamonnpetty** » 02 Sep 2019, 09:05

I recently cleared codes P2188: System too rich at idle & P0442: Small evap leak. Now I am getting codes P0101: MAF circuit/performance issue & P0102: MAF low input. I tried clearing those codes but every time I start the car the check engine light comes back on. Any help?

Post by **abscate** » 02 Sep 2019, 10:00

Quickest way is to do a smoke test, find the leaking vacuum hose/fitting, then try clearing again.

You can also look at the fuel trims to confirm the leak before you look, but on a 10 year old car, I wouldn't bother with the confirmation step

Post by **vtl** » 02 Sep 2019, 20:28

Small evap leak can be a bad (cracked) gas cap gasket.

Common places for vacuum leak in 2.5T are a small hose between turbo and over-the-engine charge pipe and PCV.