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 leaking P1325Knock 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 limit P1386Internal knock control fault in the engine computer P1401EGR valve circuit shorted to ground P1403EGR system flow deviation P1411Secondary air flow too low (bank 2)P1421Secondary air valve circuit shorted to ground P1425Purge valve circuit shorted to ground P1500Fuel pump relay circuit fault P1545Throttle valve control fault P1550Boost pressure differs from target P1556Boost pressure too low (negative deviation)P1557Boost pressure too high (positive deviation)P1570Engine computer locked by the immobiliser P1602Engine computer supply (terminal 30) too low P1611Engine light request from the gearbox module, short to ground P1626Missing message from the gearbox module on the data bus P1630Accelerator pedal sensor 1: signal too low P1633Accelerator pedal sensor 2: signal too low P1639Accelerator pedal sensors 1 and 2 don't agree P1640Engine computer memory (EEPROM) fault P1648Powertrain CAN bus fault P1649Missing message from the ABS module on the data bus P1690Engine warning light circuit fault

How VAG codes work

Besides the generic OBD-II codes (P0xxx), VAG uses its own codes. Engine and gearbox codes usually start with P1 or P3, body codes with B1, chassis codes with C1 and network codes with U1. The same number can mean something completely different on another make, so always make sure the code was read for the right make.

Our list has 39 VAG codes. Most of them are in these systems: fuel mixture, egr valve, idle and throttle. The most serious ones, where you shouldn't keep driving: P1500, P1570.

A basic cheap code reader often shows a make's own codes only as a number, or misses them altogether. Finding the real cause takes a diagnostic tool with the make's software, voltage and current measurements and often a test drive. That is what we do in the workshop: we read the codes, check the sensors and wiring, and tell you what needs fixing and roughly what it costs.

Make-specific codes

Want a definite answer?

Bring the car to our workshop in Estonia for diagnostics. We read the fault codes, test the sensors and tell you what is wrong. Repair price depends on the work involved, generally €45 per hour.

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