P2342
Cylinder 7 Above Knock Threshold
Sustained knock above the threshold on cylinder 7 — usual causes are fuel quality, carbon deposits, or cooling issues at this cylinder.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Low octane or contaminated fuelCommon
- Carbon deposits raise compression locallyPossible
Parts involved
- Knock Sensor
- Cylinder 7
P2342 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.