Audi OBD Codes: Meaning & Fixes

P0420 Powertrain The bank 1 catalytic converter no longer stores enough oxygen to clean the exhaust properly. Low P0171 Powertrain The engine computer is adding the maximum extra fuel it's allowed on bank 1 and still sees… Moderate P0700 Powertrain The transmission computer found a fault and asked for the check engine light – read the TCM… Moderate P0301 Powertrain Cylinder 1 is repeatedly failing to fire. The cause is almost always its coil, plug, injector… Moderate

P0087 Powertrain Measured fuel pressure has dropped well below what the engine computer is asking for. High P0089 Powertrain The fuel pressure regulator is getting its commands but pressure isn't responding the way it… Moderate P0171 Powertrain The engine computer is adding the maximum extra fuel it's allowed on bank 1 and still sees… Moderate P0301 Powertrain Cylinder 1 is repeatedly failing to fire. The cause is almost always its coil, plug, injector… Moderate P0341 Powertrain The bank 1 cam signal lands at the wrong crank angle, often from a stretched chain or a sticky… Moderate P0411 Powertrain The air pump runs at cold start, but the right amount of air isn't reaching the exhaust. Low P0420 Powertrain The bank 1 catalytic converter no longer stores enough oxygen to clean the exhaust properly. Low P0491 Powertrain Too little cold-start air reached the bank 1 exhaust during the self-test; pump, combi valve… Low P0492 Powertrain The cold-start air check found too little air on the bank 2 side only, so look at that side's… Low P0700 Powertrain The transmission computer found a fault and asked for the check engine light – read the TCM… Moderate P0706 Powertrain The range sensor works electrically, but its reading doesn't match where the lever and gears… Moderate P1128 Volkswagen · Powertrain VW's part-load fuel adaptation has maxed out adding fuel on bank 1 – the engine runs lean as… Moderate P1136 Volkswagen · Powertrain At idle the VW computer is adding the maximum fixed amount of fuel on bank 1 – a classic vacuum… Low P1137 Volkswagen · Powertrain At idle the VW computer is pulling out as much fuel as it's allowed on bank 1 and the mix… Low P1296 Volkswagen · Powertrain The VW ECU saw coolant temperature behave differently from its model – usually a sensor… Low P1297 Volkswagen · Powertrain Boost is escaping between turbo and throttle body – usually a split hose or a leaking diverter… Moderate P1340 Volkswagen · Powertrain The cam signal no longer lines up with the crank signal – often a jumped belt or stretched… High P1602 Volkswagen · Powertrain The engine computer saw its constant battery feed drop too low – usually a disconnected, flat… Low 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 P2015 Powertrain The sensor on the intake manifold flaps reports a position that doesn't match what the ECU… Low P2177 Powertrain Bank 1 goes lean once the engine is above idle, so the PCM keeps adding fuel at cruise… Moderate P2187 Powertrain Bank 1 runs lean at idle but recovers once rpm rises, the classic fingerprint of unmetered air. Low P2293 Powertrain The second fuel pressure control stage can't hold its target; on VW/Audi 2.0T often… Moderate P3081 Volkswagen · Powertrain The engine didn't warm up as fast as the ECU expected – most often a thermostat stuck open. Low