Volkswagen OBD Codes: Meaning & Fixes

P0300 Powertrain The engine computer sees misfires that jump between cylinders or hit several cylinders at once. High P0101 Powertrain The MAF sensor's airflow reading doesn't match what the engine computer expects… Low P0171 Powertrain The engine computer is adding the maximum extra fuel it's allowed on bank 1 and still sees… Moderate P0299 Powertrain The turbo or supercharger isn't building the boost pressure the engine computer is asking for. Moderate P0302 Powertrain Cylinder 2 keeps misfiring. On inline engines it's a middle cylinder, so rule out coolant… Moderate P0456 Powertrain The EVAP system has a tiny leak, about 0.020 inch — the hardest EVAP leak to find, and often… Minor

P0016 Powertrain The bank 1 intake cam and the crankshaft are out of step, most often from a stretched or jumped… High P0087 Powertrain Measured fuel pressure has dropped well below what the engine computer is asking for. High P0200 Powertrain The ECU found a fault in the injector control circuits that it can't pin on one cylinder, often… High P0234 Powertrain Boost rose above the safe limit the engine computer allows, so it may cut power to protect… High P0300 Powertrain The engine computer sees misfires that jump between cylinders or hit several cylinders at once. High P0685 Powertrain The engine computer can't switch its own main power relay – open coil, blown fuse or broken… High P1340 Volkswagen · Powertrain The cam signal no longer lines up with the crank signal – often a jumped belt or stretched… High P1735 Volkswagen · Powertrain The DSG control unit lost a valid signal from the sensor that tracks clutch 1 and locks out… High P175D Volkswagen · Powertrain The DSG computer saw clutch 1 let go while it was supposed to stay engaged, so it cut… High