Volkswagen OBD Codes: Meaning & Fixes

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 P0300 Powertrain The engine computer sees misfires that jump between cylinders or hit several cylinders at once. High 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

P0011 Powertrain The bank 1 intake cam sits further advanced than the PCM asked for, usually an oil or control… Moderate P0016 Powertrain The bank 1 intake cam and the crankshaft are out of step, most often from a stretched or jumped… High P0045 Powertrain The engine computer sees an open or shorted circuit to the solenoid that controls turbo boost. Moderate P0046 Powertrain The boost control solenoid circuit is intact, but boost doesn't follow what the solenoid… Moderate P0087 Powertrain Measured fuel pressure has dropped well below what the engine computer is asking for. High P0101 Powertrain The MAF sensor's airflow reading doesn't match what the engine computer expects… Low P0106 Powertrain The MAP sensor works electrically, but its pressure reading doesn't fit what the engine… Low P0118 Powertrain The coolant sensor signal sits near 5 volts, so the PCM thinks the engine is frozen solid… Low P0171 Powertrain The engine computer is adding the maximum extra fuel it's allowed on bank 1 and still sees… Moderate P0191 Powertrain The rail pressure reading is electrically valid but doesn't make sense for how the engine… Moderate P0200 Powertrain The ECU found a fault in the injector control circuits that it can't pin on one cylinder, often… High P0221 Powertrain The second throttle angle signal leaves its window or stops following the plate, so power… Moderate P0234 Powertrain Boost rose above the safe limit the engine computer allows, so it may cut power to protect… High P0272 Powertrain The ECU can't balance cylinder 4 against the rest anymore; its fuel correction is outside… Moderate P0299 Powertrain The turbo or supercharger isn't building the boost pressure the engine computer is asking for. Moderate P0300 Powertrain The engine computer sees misfires that jump between cylinders or hit several cylinders at once. High P0302 Powertrain Cylinder 2 keeps misfiring. On inline engines it's a middle cylinder, so rule out coolant… Moderate P0332 Powertrain Knock sensor 2 reads too low. On a V engine it's the bank without cylinder 1; on some fours… Low P0341 Powertrain The bank 1 cam signal lands at the wrong crank angle, often from a stretched chain or a sticky… Moderate P0351 Powertrain The engine computer found an electrical fault in coil A, the coil that fires cylinder 1 on most… Moderate P0381 Powertrain The circuit for the dash wait-to-start light has a fault. The glow plugs themselves may still… Minor P0411 Powertrain The air pump runs at cold start, but the right amount of air isn't reaching the exhaust. Low P0418 Powertrain The ECU sees a fault in the relay circuit that switches the secondary air pump on and off. Low P0443 Powertrain The ECU detected an electrical fault in the purge solenoid circuit: open, shorted or a bad… Low P0456 Powertrain The EVAP system has a tiny leak, about 0.020 inch — the hardest EVAP leak to find, and often… Minor P0491 Powertrain Too little cold-start air reached the bank 1 exhaust during the self-test; pump, combi valve… Low P0627 Powertrain The PCM's fuel pump command line has no complete circuit – a dead relay coil, open wire, fuse… Moderate P0685 Powertrain The engine computer can't switch its own main power relay – open coil, blown fuse or broken… High P0841 Powertrain Pressure sensor or switch A reports a value that doesn't fit the gear or pressure the TCM… Moderate P1128 Volkswagen · Powertrain VW's part-load fuel adaptation has maxed out adding fuel on bank 1 – the engine runs lean as… Moderate