P03A4
Cylinder 2 Pressure Too Low
Generic OBD-II
Common symptoms
What you'll notice
- Check spark plugs and replace if necessary
- Inspect ignition coil for defects and replace if needed
- Clean or replace the fuel injector for cylinder 2
- Perform a compression test on cylinder 2 and repair any issues found
- Check the wiring and connections related to cylinder 2 for any faults and repair as necessary
Common causes
Most likely first
- Faulty spark plug or ignition coil in cylinder 2.
- Clogged fuel injector in cylinder 2.
- Low compression in cylinder 2.
- Vacuum leak in cylinder 2.
- Issues with the engine control module (ECM) or fuel system in cylinder 2.
How to diagnose & fix
Work through it in order
- Engine misfires or runs rough
- Decreased acceleration or power
- Increased fuel consumption
- Engine hesitation or stumbling
- Illuminated Check Engine Light
Read & clear P03A4 yourself
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