What does code P1181 mean?

Q: What does code P1181 mean?

Linear Oxygen Sensor Reference Voltage Open. P1181 on Volkswagen vehicles means the engine control module (ECM) has detected an open circuit in the reference voltage supply to the linear oxygen sensor, which is the wideband air-fuel ratio sensor. The ECM monitors the sensor's reference voltage line and sets this code when the expected voltage is missing or out of range, preventing accurate fuel mixture control.

DTC codes / Volkswagen codes / P1181

P1181 · VolkswagenLinear Oxygen Sensor Reference Voltage Open

P1181 on Volkswagen vehicles means the engine control module (ECM) has detected an open circuit in the reference voltage supply to the linear oxygen sensor, which is the wideband air-fuel ratio sensor. The ECM monitors the sensor's reference voltage line and sets this code when the expected voltage is missing or out of range, preventing accurate fuel mixture control.

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.