P0171 and P0174 Codes after Stillen CAI - Help needed

SouthArk370Z

The car thinks you are running lean (P0171 = bank 1, P0174 = bank 2), based on exhaust O2 readings. Often caused by dirty MAFs or a vacuum leak. Since you have cleaned the MAFs, I'd check for leaks again. Since both banks are affected, I'd start looking at the MAF to manifold piping and the manifold itself.

Could be the O2 sensors but I doubt they would both go out.

If you try Elmo370z's ECU reset, don't be surprised if the windows start acting flaky - window reset procedure can be found on this site.

Edit: Wouldn't hurt to clean the MAFs again. Cheap and easy job.

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