P0314Single Cylinder Misfire (Cylinder Not Specified)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P0314 means the misfire is attributable to a single cylinder, but the module does not say which one. CARB generally requires cylinder-specific codes and allows a general code only with approval where the cylinder cannot be identified reliably; for diesels identification is required only where possible without extra hardware. GM and Ford do not use P0314. It is documented on Saab's 2.2 TiD diesel with a Bosch distributor pump, as a mechanical misfire fault in two speed and quantity windows with the warning light and limp mode limiting injection quantity; the cylinder can still be read out with a scan tool. Typical causes are a faulty injector, leaking high-pressure lines, air or water in the fuel, or low compression.
- What you may notice
- Check engine light on
- Loss of power, limp mode with quantity limit (Saab diesel)
- Rough running, vibration
- Likely causes
- LikelyInjector of one cylinder clogged or leaking (diesel), or coil/plug (petrol)
- PossibleLeaking high-pressure line, fuel bridge or injector washer
- PossibleAir, water or petrol in the diesel, clogged filter, low supply pressure
- RareCompression loss (valve, piston)
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €80 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.