What usually causes it
- A dead oxygen sensor
- A broken wire or a loose plug
- A blown fuse or relay for the sensor heater
- An engine running far too rich or too lean
P0134Starts at: OK to drive, fix when convenient
Oxygen sensor shows no activity (bank 1, sensor 1)
The oxygen sensor checks the exhaust so the computer can set the fuel mix. The computer sees no changing signal from sensor 1 on 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
- Rough idle or hesitation
- A rotten egg smell from the exhaust
Can I keep driving?
We rate P0134 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 P0134
What does P0134 mean?
Oxygen sensor shows no activity (bank 1, sensor 1). The oxygen sensor checks the exhaust so the computer can set the fuel mix. The computer sees no changing signal from sensor 1 on bank 1.
Can I keep driving with P0134?
We rate P0134 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 P0134?
The most common causes, in order: A dead oxygen sensor; A broken wire or a loose plug; A blown fuse or relay for the sensor heater; An engine running far too rich or too lean.
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.