P03A8
Cylinder 2 Combustion Performance
Generic OBD-II
Common symptoms
What you'll notice
- Check spark plugs and replace if necessary
- Inspect ignition coils and replace if faulty
- Conduct a compression test to check for any issues with the cylinder
- Check fuel injectors and clean or replace if clogged or malfunctioning
- Verify the operation of the fuel injector wiring harness and repair any faults
Common causes
Most likely first
- Faulty ignition coil
- Clogged fuel injector
- Vacuum leak in cylinder 2
- Low compression in cylinder 2
- Faulty spark plug in cylinder 2
How to diagnose & fix
Work through it in order
- Misfiring of the engine
- Reduced power and acceleration
- Rough idle or stalling
- Increased fuel consumption
- Engine hesitation or stumbling
Read & clear P03A8 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.