P1276
Air Fuel Ratio Sensor 1 Bank 1 Circuit High Voltage Detected
Severity
⚠️ MediumCan you drive?
Yes, but get it checked soon
Approx. repair cost
$33–89 (est.)
Symptoms
- Increased fuel consumption
- Reduced engine power
- Check Engine Light Is On
- Unstable engine idling
- Increased emissions
Causes
- Faulty air-fuel ratio sensor
- Open or short circuit in the sensor circuit
- Problems with the wiring harness or connectors
- Engine ECU malfunction
- Sensor circuit grounding problems
How to Fix
- Check the condition of the AFR sensor and its connectors
- Check the integrity of the sensor circuit (breaks, short circuits)
- Check sensor voltage and resistance to specifications
- Replace faulty air-fuel ratio sensor if necessary
- Check and, if necessary, reflash the engine ECU