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Old 05-15-2018, 12:08 AM   #626
Scooby Specialist
Member#: 29292
Join Date: Nov 2002
Chapter/Region: SCIC
Location: Orange County CA
2004 WRX wagon


Originally Posted by jawang213 View Post
having the same issue as you guys. i have an 06 wrx with a p0171 only mods i have is an AP with stage 1 91 octane tune map and a invidia down pipe heres what ive replace/checked

replaced upstream a/f sensor
replaced downstream 02 sensor
replaced leaking intake manifold gasket
swapped/cleaned MAF sensor (swapped with good reliable one)
checked fuel pressure 38-40psi 50-52psi with return line clamped
smoke tested intake system (found no additional leaks)
replaced pcv hose
cleaned throttle body
replaced air filter

noticed that this code only appears when im at idle. checked my fuel trims with obd tester and found that its sitting at max correction +25% which would indicate lean but when analyzing 02 sensor it indicates rich condition (which you can noticeably smell) looking for any ideas of anything to check or replace code came on out of nowhere no major repairs or no tune changes. please help!
Where did you buy your wide band sensor? also how do you know the MAf is good?
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Old 05-31-2018, 04:07 PM   #627
Scooby Newbie
Member#: 486639
Join Date: May 2018
Chapter/Region: MAIC
Location: Pittsburgh, PA
2005 wrx, 9-2x
silver :(


to add my fix to this.
05 wrx, started throwing code and running like garbage. before i got the code i would get mild surging/hesitation at wot. after the code and running like garbage i started getting misfire codes along with the 171.
fpr/fuel pump and filter solved all of it. took that opportunity to switch the fuel filter to the engine bay like the 02-04 wrx
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