OBD codes / P0051
P0051
ModerateO2 Sensor Heater Control Circuit Low (Bank 2, Sensor 1)
Get it looked at soon to avoid further wear.
Likely causes
- failed O2 sensor heater element
- blown heater fuse
- wiring/connector fault
Common fixes
- replace the bank 2 sensor 1 O2 sensor
- check the heater fuse and wiring
Seeing P0051 on your car? Get a diagnosis specific to your exact year, make and model.
Diagnose P0051 for my vehicleGeneric OBD-II reference. Manufacturer-specific behavior varies — confirm with a scan tool and, for safety-related codes, a professional inspection.