P03A8
Cylinder 2 Combustion Performance
P03A8 is an OBD-II diagnostic trouble code meaning: Cylinder 2 Combustion Performance. Common causes: clogged or faulty injector of cylinder 2, worn or carbonated spark plug. Estimated repair cost: $22–278.
Symptoms
- Check Engine light on
- Increased fuel consumption
- Smell of unburned fuel from the exhaust
- Unstable operation at idle
- Reduced dynamic characteristics of the vehicle
Causes
- Clogged or faulty injector of cylinder 2
- Worn or carbonated spark plug
- Weak ignition coil cylinder 2
- Reduced compression in cylinder 2
- Incorrect valve timing
How to Fix
- Check and, if necessary, replace the spark plug of cylinder 2
- Check the ignition coil of cylinder 2 (exchange with another cylinder for testing)
- Diagnose cylinder 2 injector - fuel balance, spray
- Perform a compression test on cylinder 2
- Check valve timing and condition of valves
- After repair, reset codes and test drive
Related codes
Error P03A8 by Vehicle Brand
FAQ
What does the P03A8 code mean?
P03A8 is an OBD-II diagnostic trouble code that indicates: Cylinder 2 Combustion Performance
What causes a P03A8 error code?
The most common causes of P03A8 include: Clogged or faulty injector of cylinder 2; Worn or carbonated spark plug; Weak ignition coil cylinder 2; Reduced compression in cylinder 2.
How do I fix a P03A8 diagnostic trouble code?
To fix P03A8: Check and, if necessary, replace the spark plug of cylinder 2. Check the ignition coil of cylinder 2 (exchange with another cylinder for testing). Diagnose cylinder 2 injector - fuel balance, spray. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P03A8?
Do not drive — repair immediately
How much does it cost to fix P03A8?
The estimated repair cost for P03A8 is $22–278. Actual cost depends on your vehicle, location, and labor rates.
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