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P0101 & P0102 not clearing

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eamonnpetty
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eamonnpetty

P0101 & P0102 not clearing

Post by eamonnpetty » Mon Sep 02, 2019 9:05 am

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?



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abscate
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Re: P0101 & P0102 not clearing

Post by abscate » Mon Sep 02, 2019 10:00 am

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


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Re: P0101 & P0102 not clearing

Post by vtl » Mon Sep 02, 2019 8:28 pm

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.


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