Cylinder 9 Pressure Variation High
Cylinder-to-cylinder pressure variation on cylinder 9 is above the calibrated maximum — combustion is unstable cycle-to-cycle, typical of partial misfire or injector seat erosion.
Affected components
- Cylinder 9 combustion
- Cylinder pressure sensor 9
Common causes
- High likelihood: Rough combustion - excessive cycle-to-cycle variation
- Medium likelihood: Injector intermittent on cylinder 9
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.