P1173
Front Heated O2 Sensor No Inversion
Severity
⚠️ MediumCan you drive?
Yes, but get it checked soon
Approx. repair cost
$28–89 (est.)
Symptoms
- Increased fuel consumption
- Unstable engine idling
- Check Engine Light Illuminates
- Reduced engine power
- Increased emissions of harmful substances
Causes
- Front oxygen sensor malfunction
- Open or short circuit in the sensor circuit
- Poor contact in the sensor connector
- Sensor heating element malfunction
- Problems with the engine ECU
How to Fix
- Check the condition and connection of the oxygen sensor
- Check the integrity of the sensor circuit
- Check the resistance of the sensor heating element
- Replace a faulty oxygen sensor
- If necessary, check/replace the engine ECU