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Old 10-04-2003, 02:49 AM   #15
CarTuned
Scooby Specialist
 
Member#: 42203
Join Date: Aug 2003
Chapter/Region: TXIC
Location: SATX
Vehicle:
2011 WRX
WRB

Thumbs up Possible solution to P0171

Well, I can't say for certain that this will work for anyone else, but I tried everything to fix the CEL P0171 when it came on. At first, I thought it was the octane booster I had added that messed up the wideband O2 sensor. Then, I figured it may be a dirty injector. Until, one day, I decided to change my AEM CAI back to the stock box since I kept reading that everyone else who had this CEL did the same thing and got rid of it. But after two hours of having gone back to the stock filter box, I couldn't take it anymore, so I started to reinstall the AEM CAI. Thats when I happened to take a close look at the MAF sensor diode, or whatever it's called, and noticed it was really dirty. I guess the oil from the filter made its' way up the intake on started to build unto the MAF sensor itself. At this point, I took a clean rag, and carefully wiped away all the built up grime. After that, I finished reinstalling the CAI and turned on the car. At first, I expected the light to come right back on, like it had three times prior to this, but it didn't. Now it's been three days and still no CEL has come on.

Hopefully, everyone else can get rid of that P0171 CEL with a simple wipe, but I can't make any promises that it'll work.

If anyone else tries this and it works for them, let me know...thanx
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