VAG fault codes
Volkswagen, Audi, Škoda and Seat use their own P1 codes on top of the generic P0 codes. A diagnostic tool often shows them next to VAG's own five-digit code. The same P1 code means something else on another make. Check the make first.
P1093Fuel system fault, fuel pressure unstable (FSI/TFSI)P1128Long-term fuel trim too lean, multiplicative (bank 1)P1129Long-term fuel trim too rich, multiplicative (bank 1)P1130Long-term fuel trim too lean, multiplicative (bank 2)P1131Long-term fuel trim too rich, multiplicative (bank 2)P1136Fuel trim too lean, additive (bank 1)P1137Fuel trim too rich, additive (bank 1)P1138Fuel trim too lean, additive (bank 2)P1139Fuel trim too rich, additive (bank 2)P1181EGR valve control (diesel)P1296Cooling system fault (thermostat or sensor)P1297Boost hose between turbo and throttle leakingP1325Knock control at its limit (cylinder 1)P1326Knock control at its limit (cylinder 2)P1327Knock control at its limit (cylinder 3)P1328Knock control at its limit (cylinder 4)P1336Engine torque monitoring adaptation at limitP1386Internal knock control fault in the engine computerP1401EGR valve circuit shorted to groundP1403EGR system flow deviationP1411Secondary air flow too low (bank 2)P1421Secondary air valve circuit shorted to groundP1425Purge valve circuit shorted to groundP1500Fuel pump relay circuit faultP1545Throttle valve control faultP1550Boost pressure differs from targetP1556Boost pressure too low (negative deviation)P1557Boost pressure too high (positive deviation)P1570Engine computer locked by the immobiliserP1602Engine computer supply (terminal 30) too lowP1611Engine light request from the gearbox module, short to groundP1626Missing message from the gearbox module on the data busP1630Accelerator pedal sensor 1: signal too lowP1633Accelerator pedal sensor 2: signal too lowP1639Accelerator pedal sensors 1 and 2 don't agreeP1640Engine computer memory (EEPROM) faultP1648Powertrain CAN bus faultP1649Missing message from the ABS module on the data busP1690Engine warning light circuit fault
Make-specific codes
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