OBD codes / P0135
P0135
ModerateO2 Sensor Heater Circuit (Bank 1, Sensor 1)
Get it looked at soon to avoid further wear.
Likely causes
- failed oxygen sensor heater
- blown fuse
- wiring fault
Common fixes
- replace the upstream O2 sensor
- check the heater fuse and wiring
Seeing P0135 on your car? Get a diagnosis specific to your exact year, make and model.
Diagnose P0135 for my vehicleGeneric OBD-II reference. Manufacturer-specific behavior varies — confirm with a scan tool and, for safety-related codes, a professional inspection.