P1157
Air/Fuel Ratio Sensor 1 Range/Performance Problem
P1157 is an OBD-II diagnostic trouble code meaning: Air/Fuel Ratio Sensor 1 Range/Performance Problem. Common causes: air/fuel ratio sensor malfunction, damaged or corroded sensor wiring. Estimated repair cost: $33–89.
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
Related codes
Error P1157 by Vehicle Brand
FAQ
What does the P1157 code mean?
P1157 is an OBD-II diagnostic trouble code that indicates: Air/Fuel Ratio Sensor 1 Range/Performance Problem
What causes a P1157 error code?
The most common causes of P1157 include: Air/fuel ratio sensor malfunction; Damaged or corroded sensor wiring; Vacuum leaks in the intake manifold; Problems with the fuel system (injectors, fuel pump).
How do I fix a P1157 diagnostic trouble code?
To fix P1157: Check the integrity of the sensor wiring and connectors. Clean the sensor contacts from corrosion. Check for vacuum leaks. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P1157?
Yes, but get it checked soon
How much does it cost to fix P1157?
The estimated repair cost for P1157 is $33–89. Actual cost depends on your vehicle, location, and labor rates.
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