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Old 02-11-2021, 08:42 PM
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upallnight upallnight is offline
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P0171 code means that, on the first bank of the engine, the fuel system is running weak or a vacuum leak exists near this side of the engine. A lean condition occurs when the engine either receives too little fuel or too much air. Most likely too much air.

P0505 is an indication the IAC is not working correctly and it can cause the engine to idle too low or high and the engine may stall when coming to a stop. ... The code may be from the engine has a vacuum leak and this can cause the engine to run rough and have poor fuel mileage. Does the IAC makes a rattling sound when you shake it?
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