What it means
The ECU detects no switching or too slow a response from the downstream O2 sensor on bank 2. Often aged or poisoned sensor; downstream sensors usually flat but must respond on diagnostic monitor runs.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
Bank 2 Sensor 2 is the downstream oxygen sensor behind the catalytic converter on the engine's second bank. The ECU monitors its signal for activity and response; P0160 sets when that signal stays inactive or responds too slowly during the conditions used to check it.
Common causes
Most likely first.
- Sensor aged or poisoned
- Heater circuit weak
Symptoms
- Check engine light on
- Increased fuel consumption
- Possible rough idle or hesitation
- Failed emissions test
How to diagnose it
- Check freeze-frame data and live oxygen-sensor readings to confirm that Bank 2 Sensor 2 is inactive or slow under the monitor conditions.
- Inspect the downstream sensor's wiring and connector near the exhaust for corrosion, damage, or a poor connection.
- Check for exhaust leaks near Bank 2 Sensor 2 that could distort its reading.
- Verify that the sensor heater circuit operates and that the sensor reaches operating temperature.
- Compare the downstream reading with the upstream Bank 2 sensor and test the sensor signal circuit against the manufacturer's specification.
Common fixes
- Repair damaged or poorly connected Bank 2 Sensor 2 wiring.
- Repair an exhaust leak affecting the sensor reading.
- Repair the sensor heater circuit if it is weak or inoperative.
- Replace Bank 2 Sensor 2 if its signal remains inactive or slow after circuit and leak checks.
Can I keep driving?
The vehicle will often remain driveable, but the fault can prevent emissions monitoring from completing and may increase fuel use. Avoid ignoring it if the engine runs poorly or the warning light flashes.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.