P03AF
Cylinder 3 Pressure Too High
Generic OBD-II
Real-world scan data
Seen in
24
scans in the past year
Found in
<0.1%
of scans
<0.1%
of scans that found faults
Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.
Common symptoms
What you'll notice
- Check for any vacuum leaks in the intake manifold or throttle body.
- Inspect and clean the fuel injectors, ensuring they are functioning properly.
- Perform a compression test to determine if there is any engine damage or worn piston rings.
- Verify proper functioning of the ignition system, including spark plugs and ignition coils.
Common causes
Most likely first
- Faulty fuel injector
- Engine misfire in cylinder 3
- Faulty spark plug in cylinder 3
- Carbon build
- up in cylinder 3
- Engine overheating
How to diagnose & fix
Work through it in order
- Engine misfires or runs rough
- Decreased fuel efficiency
- Engine hesitation or stumbling
- Check Engine Light (CEL) illuminates
- Loud knocking or pinging noises
Read & clear P03AF yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.