Powertrain
generic / SAE
P0314
Single Cylinder Misfire — Cylinder Not Specified
A persistent misfire is detected on one cylinder, but the engine controller cannot identify which cylinder is affected. Often seen on engines without per-cylinder feedback or when crank position correlation fails.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number3 / 14
Possible causes
- Weak ignition component on one cylinder high
- Injector partially clogged medium
- Low compression on one cylinder low
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: medium
- DIY: shop recommended
- Estimated cost: 80–800 €
- Estimated time: 0.5–4 h
- Component: ignition coil
- Component: injector
- Component: spark plug
- Component: ecm
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012