Powertrain
generic / SAE
P2339
Cylinder 4 Above Knock Threshold
The knock sensor channel for cylinder 4 has registered combustion noise above the calibrated knock threshold beyond what the spark retard map can correct. Often associated with low-octane fuel, EGR malfunction or carbon-induced hot spots.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number3 / 39
Possible causes
- Low octane fuel used high
- Carbon deposits causing pre-ignition medium
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 40–800 €
- Estimated time: 0.5–4 h
- Component: knock sensor
- Component: spark plug
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012