P03E0
Cylinder 8 Pressure Too Low
Generic OBD-II
Real-world scan data
Seen in
38
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 spark plugs and ignition system for any issues or damage.
- Inspect the fuel injector for clogs or malfunctions and clean or replace if necessary.
- Perform a compression test on the cylinder to check for any internal engine problems.
- Check the wiring and connections to the cylinder's fuel injector and ignition coil.
- If all else fails, consider replacing the cylinder head or piston rings for a more thorough fix.
Common causes
Most likely first
- Faulty spark plug or ignition coil in cylinder 8
- Fuel injector malfunction in cylinder 8
- Low compression in cylinder 8
- Vacuum leak in cylinder 8
- Faulty engine control module (ECM) affecting cylinder 8
How to diagnose & fix
Work through it in order
- Engine misfires and runs rough
- Decreased engine power and performance
- Rough idling or stalling
- Increased fuel consumption
- Illuminated check engine light
Read & clear P03E0 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.