DTC codes / P00xx · Fuel and air metering and auxiliary emission controls / P0050
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.
Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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