P0160 — O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 2)
Can drive — fix at your convenience.
What P0160 means
This code means the engine computer is detecting no activity from the downstream oxygen sensor on bank 2, getting a dead or flat signal instead of normal switching. It's most often caused by a failed rear sensor, but bad wiring, a blown fuse, or a bad connector can also be responsible. The typical fix is replacing the sensor, and it usually doesn't involve major engine repair.
Common symptoms
- Check engine light is on
- Usually no change in driving feel
- Possible slight decrease in fuel economy
- Failed emissions or readiness monitor test
- No data from the rear sensor on a scan tool
Common causes
- Failed downstream O2 sensor on bank 2
- Open or shorted sensor signal wiring
- Blown fuse or bad ground in the sensor circuit
- Corroded or disconnected sensor connector
- Exhaust leak near the rear sensor
Typical repair cost
$150 – $350
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0160 code?
Usually yes. The rear sensor mainly monitors emissions, so the car typically drives normally. Just get it diagnosed before an emissions test, since the warning light won't clear on its own.
How much does it cost to fix a P0160 code?
Most repairs cost about $150 to $350. The downstream oxygen sensor and labor are the bulk of the cost, while a simple wiring or fuse repair can be cheaper.
Is a P0160 code serious?
It's a low-severity code. It rarely affects how the car runs, but it leaves the check engine light on and can cause an emissions test failure, so it shouldn't be ignored long-term.
What does 'no activity detected' mean for P0160?
It means the rear sensor on bank 2 isn't producing the voltage signal a healthy sensor would. Instead of fluctuating with the exhaust, it's flat or dead, which usually points to a worn-out sensor or a broken circuit.