Powertrain
generic / SAE
P0312
Cylinder 12 Misfire Detected
Misfires concentrated on cylinder 12. A cylinder-specific code points away from shared causes (fuel pressure, MAF) toward components dedicated to that cylinder — coil, spark plug, injector, compression.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number3 / 12
Possible causes
- Ignition coil failed high
Symptoms
- Check engine light on or flashing
- Rough idle and uneven running
- Power loss, hesitation under acceleration
- Increased fuel consumption
- Possible smell of unburned fuel from exhaust
Inspection / repair
- Difficulty: easy
- DIY: possible
- Estimated cost: 30–400 €
- Estimated time: 0.3–2 h
- Component: ignition coil
- Component: spark plug
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012