Cylinder 8 Above Knock Threshold
Sustained knock above the threshold on cylinder 8 — typical on V8 engines under load with poor fuel.
Affected components
- Knock sensor
- Cylinder 8
Common causes
- High likelihood: Low octane or contaminated fuel
- Medium likelihood: Carbon deposits raise compression locally
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
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.