What does code P1179 mean?

Q: What does code P1179 mean?

Linear Oxygen Sensor Pump Current Short To Ground. P1179 on Volkswagen vehicles means the engine control module (ECM) has detected a short to ground on the pump current circuit of a linear oxygen sensor, which is the wideband air-fuel ratio sensor used on many VW engines. The sensor's internal pump cell requires a precise current to maintain a reference air-fuel ratio, and a short to ground prevents the ECM from controlling that current, so the sensor signal becomes unreliable or fixed.

DTC codes / Volkswagen codes / P1179

P1179 · VolkswagenLinear Oxygen Sensor Pump Current Short To Ground

P1179 on Volkswagen vehicles means the engine control module (ECM) has detected a short to ground on the pump current circuit of a linear oxygen sensor, which is the wideband air-fuel ratio sensor used on many VW engines. The sensor's internal pump cell requires a precise current to maintain a reference air-fuel ratio, and a short to ground prevents the ECM from controlling that current, so the sensor signal becomes unreliable or fixed.

SystemPowertrain

Code typeVolkswagen specific

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering

Guidance is general and written for Volkswagen vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.