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
P0161Starts at: OK to drive, fix when convenient
Oxygen sensor heater circuit problem (bank 2, sensor 2)
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 2, after the catalytic converter (the exhaust part that cleans the fumes), on bank 2.
Check this first
Check the fuse for the oxygen sensor heater. Your owner manual shows which fuse it is.
What to watch for
- A rotten egg smell from the exhaust
- Poor gas mileage
- A flashing check engine light, which means a bad misfire
Can I keep driving?
We rate P0161 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 P0161
What does P0161 mean?
Oxygen sensor heater circuit problem (bank 2, sensor 2). 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 2, after the catalytic converter (the exhaust part that cleans the fumes), on bank 2.
Can I keep driving with P0161?
We rate P0161 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 P0161?
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.