P1157
Air/Fuel Ratio Sensor 1 Range/Performance Problem
Severity
⚠️ MediumCan you drive?
Yes, but get it checked soon
Approx. repair cost
$33–89 (est.)
Symptoms
- Unstable engine operation at idle
- Increased fuel consumption
- Reduced engine power
- Check Engine Light Is On
- Dips during acceleration
Causes
- Air/fuel ratio sensor malfunction
- Damaged or corroded sensor wiring
- Vacuum leaks in the intake manifold
- Problems with the fuel system (injectors, fuel pump)
- Sensor contamination due to the use of low-quality fuel
How to Fix
- Check the integrity of the sensor wiring and connectors
- Clean the sensor contacts from corrosion
- Check for vacuum leaks
- Replace air/fuel ratio sensor if necessary
- Check the operation of the fuel system