P0094Fuel System Leak Detected - Small Leak
- 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
- A leak in the high-pressure fuel system is not measured directly but inferred from a pressure and volume balance. P0094 is typically detected when rail pressure drops too fast during overrun with injection cut off, or when more pump delivery than expected is needed at idle. Possible leaks are injectors with too much leak-off, fittings or relief valves; internal leakage can dilute the engine oil with fuel, so a rising oil level is a warning sign.
- What you may notice
- Check engine light on
- Long cranking
- Rising engine oil level from fuel dilution
- Slight loss of power
- Likely causes
- LikelyInjector with excessive leak-off
- LikelyHigh-pressure fitting slightly leaking
- PossiblePressure relief valve leaking
- RareEngine control software (manufacturer updates exist)
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.