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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.

Running on fumes Free guides aren't free to make. Top up the tank. Any amount, one time. Fuel the Garage