What usually causes it
- A failed heater inside the oxygen sensor, which means a new sensor
- A blown fuse
- A loose plug or damaged wiring
- A bad relay
P0135Starts at: OK to drive, fix when convenient
Oxygen sensor heater circuit problem (bank 1, sensor 1)
An oxygen sensor has a small heater so it works soon after you start the car. The computer found a problem with the heater on sensor 1, bank 1.
Check this first
Check the fuse for the oxygen sensor heater. Your owner manual shows which fuse it is.
What to watch for
- Poor gas mileage, mostly on cold starts
- Rough idle for the first minute
- A rotten egg smell from the exhaust
Can I keep driving?
We rate P0135 as OK to drive, fix when convenient, as a starting point. Keep an eye on the signs below. If the light starts flashing, stop driving soon.
Quick answers about P0135
What does P0135 mean?
Oxygen sensor heater circuit problem (bank 1, sensor 1). An oxygen sensor has a small heater so it works soon after you start the car. The computer found a problem with the heater on sensor 1, bank 1.
Can I keep driving with P0135?
We rate P0135 as OK to drive, fix when convenient, as a starting point. Keep an eye on the signs below. If the light starts flashing, stop driving soon.
What usually causes P0135?
The most common causes, in order: A failed heater inside the oxygen sensor, which means a new sensor; A blown fuse; A loose plug or damaged wiring; A bad relay.
Estimates only. A mechanic should confirm. The same code can mean slightly different things on different cars; the app explains it for your exact year, make, model and mileage.