What does code P1187 mean?

Q: What does code P1187 mean?

Linear Oxygen Sensor Compensation Resistor Open. P1187 on Volkswagen vehicles means the engine control module (ECM) has detected an open circuit in the compensation resistor that is built into the linear oxygen sensor (wideband lambda sensor). The ECM uses this resistor to calibrate the sensor's pumping current, so an open resistor prevents accurate air-fuel ratio measurement and triggers the warning light.

DTC codes / Volkswagen codes / P1187

P1187 · VolkswagenLinear Oxygen Sensor Compensation Resistor Open

P1187 on Volkswagen vehicles means the engine control module (ECM) has detected an open circuit in the compensation resistor that is built into the linear oxygen sensor (wideband lambda sensor). The ECM uses this resistor to calibrate the sensor's pumping current, so an open resistor prevents accurate air-fuel ratio measurement and triggers the warning light.

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.