What usually causes it
- An old, worn out oxygen sensor
- An exhaust leak near the sensor
- Oil, coolant or fuel residue that has coated the sensor
- Damaged wiring or a loose plug
P0133Starts at: OK to drive, fix when convenient
Oxygen sensor is slow to react (bank 1, sensor 1)
The oxygen sensor checks the exhaust so the computer can set the fuel mix. Sensor 1 on bank 1 reacts too slowly to changes, which often happens as it gets old.
Check this first
Listen for ticking or hissing from the exhaust near the engine, which points to a leak.
What to watch for
- Poor gas mileage
- Rough idle or hesitation
- A rotten egg smell from the exhaust
Can I keep driving?
We rate P0133 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 P0133
What does P0133 mean?
Oxygen sensor is slow to react (bank 1, sensor 1). The oxygen sensor checks the exhaust so the computer can set the fuel mix. Sensor 1 on bank 1 reacts too slowly to changes, which often happens as it gets old.
Can I keep driving with P0133?
We rate P0133 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 P0133?
The most common causes, in order: An old, worn out oxygen sensor; An exhaust leak near the sensor; Oil, coolant or fuel residue that has coated the sensor; Damaged wiring or a loose plug.
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.