P0171 subaru comments help us improve autocodescom leave a comment below or tell us if the information above help you fix the code what are the symptoms on your vehicle for the p0171 subaru code have you replaced any parts any information is appreciated thanks. P0171 subaru description with the air fuel mixture ratio self learning control the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. One of the most common trouble codes with the subaru impreza is the p0171 code this code number references a number that is given to you when you plug your car into a obdii scanner its not the most complicated obdii trouble code to diagnose it is also one of the most common. Code always reads as p0171 so far i have changed the maf had a vacuum leak smoke test done and changed the spark plugs at 70k miles code still popping up the dealer here in tampa wants 70 to do a diagnostic which im assuming means reading the codes and guessing what part to change next
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