P0135 O2 Sensor Heater Circuit (Bank 1, Sensor 1)
What does P0135 mean?
P0135 — O2 Sensor Heater Circuit (Bank 1, Sensor 1) (bank 1). This is an OBD-II diagnostic trouble code a scanner retrieves when your vehicle's computer detects o2 sensor heater circuit (bank 1, sensor 1) on bank 1. The level of risk depends on how the vehicle is currently running and how long you've been driving with the light on.
Common causes of P0135
- Blown O2 sensor heater fuse
- Open or shorted heater wiring
- Failed sensor heater element
- Corroded connector
- Faulty PCM heater driver
How to fix P0135
- Check the sensor heater fuse and relay
- Measure heater resistance between the sensor heater pins
- Verify ignition power and ground at the heater circuit
- Replace the sensor if the heater tests open or shorted
- Repair any wiring or connector damage and clear the code