P0160
O2 Sensor Circuit No Activity Detected (Bank 2, Sensor 2)
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P0160 means the PCM has detected absolutely no voltage activity from the downstream oxygen sensor on Bank 2. Unlike a slow response code where the sensor is working but sluggishly, this code indicates the sensor's signal is completely flat — it is not switching between rich and lean at all. This is a more serious condition than a slow response because the PCM has lost all monitoring capability for the Bank 2 catalytic converter.
This code is often caused by a completely dead sensor, but before replacing it, always check the basics first. Inspect the wiring harness running to the sensor for breaks, especially where it routes near hot exhaust components. Also verify the connector is securely plugged in — road debris or service work can sometimes knock a sensor connector loose.
While you can still drive your vehicle with this code, it is rated as moderate severity because the PCM cannot monitor catalytic converter health on Bank 2, and on some vehicles the PCM may default to a richer fuel strategy as a precaution, significantly hurting fuel economy. Address this repair within the next week to avoid wasting fuel and to ensure your emissions system is functioning properly.
Severity
Symptoms
- •Check Engine Light is on
- •Noticeably poor fuel economy
- •Engine may run rough or stumble
- •Increased exhaust emissions
- •Possible hesitation or surging
- •Strong exhaust odor
Likely Causes
The downstream O2 sensor on Bank 2 has completely failed and is no longer producing any voltage signal, meaning the PCM receives a flat-line reading with no switching activity.
A broken, disconnected, or severed wire in the O2 sensor circuit has completely interrupted the signal path between the sensor and the PCM.
The electrical connector at the O2 sensor has become unplugged, broken, or so severely corroded that no electrical contact is being made.
The fuse that powers the O2 sensor heater circuit has blown, preventing the sensor from reaching operating temperature and producing any signal.
The input circuit in the PCM that reads the O2 sensor signal has failed, making it appear as though the sensor has no activity.
Estimated Cost
Professional Repair
Includes parts + labor
Common Fixes
- Replace the Bank 2 Sensor 2 oxygen sensor
- Reconnect or replace damaged wiring harness
- Repair or replace the sensor connector
- Check and replace the O2 sensor heater circuit fuse
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