Powertrain
generic / SAE
P2340
Cylinder 5 Above Knock Threshold
The knock-sensor evaluation reports cylinder 5 above the knock threshold over a sustained window. The ECU retards ignition for that cylinder; persistent knock indicates poor fuel quality, carbon deposits or cooling issues.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number3 / 40
Possible causes
- Low octane or contaminated fuel high
- Carbon deposits raise compression locally medium
- Local cooling issue at cylinder 5 low
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 50–600 €
- Estimated time: 0.5–4 h
- Component: knock sensor
- Component: cylinder 5
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012