Inspect all vacuum lines and hoses for leaks, and make sure they are properly connected. If other OBDII codes are present, they must be addressed first. Use FIXD to scan your vehicle to verify the Chevrolet P0171 code is the only DTC present. STEP 1: USE FIXD TO ENSURE NO OTHER CHECK ENGINE LIGHT CODES ARE PRESENT Tools/parts needed (our top picks from Amazon): This repair requires mechanical knowledge and is not recommended for beginners. Diagnosis requires more specialized equipment beyond what the FIXD Sensor can provide and it can be a time and labor-intensive process for inexperienced DIYers. Keep in mind this is an intermediate-level diagnosis and repair and not recommended for beginners. If you’d like to try to fix trouble code P0171 at home without throwing money at parts, you’ll want to follow the steps below for proper diagnosis. Air fuel sensor or oxygen sensor $200-$300.
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