P231B
Cylinder 8 Air-Fuel Ratio Imbalance - Adjustment At Limit During Balance
P231B is an OBD-II diagnostic trouble code meaning: Cylinder 8 Air-Fuel Ratio Imbalance - Adjustment At Limit During Balance. Common causes: dirty or faulty injectors of cylinder 8, problems with the ignition system in cylinder 8. Estimated repair cost: $22–167.
Symptoms
- Unstable engine operation
- Reduced engine power
- Increased fuel consumption
- Check Engine Light
- Vibrations at idle
Causes
- Dirty or faulty injectors of cylinder 8
- Problems with the ignition system in cylinder 8
- Low compression in cylinder 8
- Vacuum leaks in cylinder 8 pipes
- Oxygen sensor malfunction
How to Fix
- Check and, if necessary, replace the injector of cylinder 8
- Check the spark plug and ignition coil of cylinder 8
- Measure compression in cylinder 8
- Check the tightness of the intake manifold and vacuum lines
- Check the functionality of the oxygen sensors
Related codes
Error P231B by Vehicle Brand
FAQ
What does the P231B code mean?
P231B is an OBD-II diagnostic trouble code that indicates: Cylinder 8 Air-Fuel Ratio Imbalance - Adjustment At Limit During Balance
What causes a P231B error code?
The most common causes of P231B include: Dirty or faulty injectors of cylinder 8; Problems with the ignition system in cylinder 8; Low compression in cylinder 8; Vacuum leaks in cylinder 8 pipes.
How do I fix a P231B diagnostic trouble code?
To fix P231B: Check and, if necessary, replace the injector of cylinder 8. Check the spark plug and ignition coil of cylinder 8. Measure compression in cylinder 8. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P231B?
Limited driving only, diagnose soon
How much does it cost to fix P231B?
The estimated repair cost for P231B is $22–167. Actual cost depends on your vehicle, location, and labor rates.
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