What usually causes it
- A worn out or failed oxygen sensor
- An exhaust leak before the sensor
- An air leak or weak fuel delivery that makes the engine run lean
- A wire rubbing on metal
P0151Starts at: OK to drive, fix when convenient
Oxygen sensor reads low (bank 2, sensor 1)
The oxygen sensor checks the exhaust so the computer can set the fuel mix. Sensor 1 on bank 2 is sending a low signal, which can mean too much air in the mix or a failing sensor.
Check this first
Listen for ticking or hissing from the exhaust near the engine, which points to a leak. Check for cracked rubber hoses too.
What to watch for
- Poor gas mileage
- Rough idle, hesitation or stumbling
- A flashing check engine light, which means a bad misfire
Can I keep driving?
We rate P0151 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 P0151
What does P0151 mean?
Oxygen sensor reads low (bank 2, sensor 1). The oxygen sensor checks the exhaust so the computer can set the fuel mix. Sensor 1 on bank 2 is sending a low signal, which can mean too much air in the mix or a failing sensor.
Can I keep driving with P0151?
We rate P0151 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 P0151?
The most common causes, in order: A worn out or failed oxygen sensor; An exhaust leak before the sensor; An air leak or weak fuel delivery that makes the engine run lean; A wire rubbing on metal.
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.