P1149
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
- Dips during acceleration
Causes
- Faulty air/fuel ratio sensor
- Open or short circuit in the sensor circuit
- Poor contact in the sensor connector
- Air leaks in the intake tract
- Problems with the fuel system (injectors, pressure regulator)
How to Fix
- Check the integrity of the sensor circuit
- Inspect the sensor connector for corrosion or damage.
- Check sensor parameters using a scanner
- Replace air/fuel ratio sensor if necessary
- Check the tightness of the intake tract