What does code P0050 mean?

Q: What does code P0050 mean?

HO2S Heater Control Circuit (Bank 2 Sensor 1). P0050 indicates that the powertrain control module has detected a fault in the heater control circuit for the upstream oxygen sensor on bank 2, which is the side of the engine that does not contain cylinder number one. The computer monitors the heater circuit for expected voltage or current changes when the heater is commanded on, and it sets this code when the circuit does not respond as designed.

DTC codes / P00xx · Fuel and air metering and auxiliary emission controls / P0050

P0050HO2S Heater Control Circuit (Bank 2 Sensor 1)

P0050 indicates that the powertrain control module has detected a fault in the heater control circuit for the upstream oxygen sensor on bank 2, which is the side of the engine that does not contain cylinder number one. The computer monitors the heater circuit for expected voltage or current changes when the heater is commanded on, and it sets this code when the circuit does not respond as designed.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering and auxiliary emission controls

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