P1165
Air/Fuel Ratio Sensor 1 Circuit Range/Performance
Severity
⚠️ MediumCan you drive?
Yes, but get it checked soon
Approx. repair cost
$33–89 (est.)
Symptoms
- Unstable engine operation
- Increased fuel consumption
- Check Engine light comes on
- Reduced engine power
- Increased emissions of harmful substances
Causes
- Air/fuel ratio sensor malfunction
- Open or short circuit in the sensor circuit
- Poor contact in the sensor connector
- Problems with power or grounding of the sensor
- Engine control unit malfunction
How to Fix
- Check the integrity of the sensor circuit
- Check the sensor connector and contacts
- Check the power supply and grounding of the sensor
- Replace air/fuel ratio sensor if necessary
- Check and, if necessary, update the engine control unit software