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Discussion Starter · #1 · (Edited)
After getting these codes and replacing my original MAF, I thought that they would go away.

ECM-120C: Air mass - Signal too High
ECM-21EB: Long-term fuel trim, bank 1 - Signal missing

Seems I wasn't so lucky. Have any of you guys gotten these same two codes? Any advice on how to resolve them? The car idles smoothly since the replacement and performance seems fine. I'd like to get these codes taken care of and make sure that I'm getting maximum fuel economy, if possible.
 

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ECM-120C, I'd check for air leaks in your inlet piping.

ECM-21EB, is your front O2 sensor. Exhaust leak at the DP or manifold, or possibly a bad sensor.
 

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Discussion Starter · #3 ·
Hmmm, I'll take a look this weekend. I'd like to be running code free.
 

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Have you done anything to the car lately?
 

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My fuel trims were all whacky ad I replaced my front 02 and it solved that problem
 

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Discussion Starter · #6 ·
Have you done anything to the car lately?
I pulled the turbo for a rebuild on New Years Eve, and I overhauled the PCV system about 4 months ago. I'm not sure how long it's been throwing these codes though. I only bought the reader around 3 weeks ago.
 

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Discussion Starter · #7 ·
My fuel trims were all whacky ad I replaced my front 02 and it solved that problem
I'll give the O2 sensor a look too. If it's pretty fouled, it may be the obvious culprit.
 
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