P0093Fuel System Leak Detected - Large 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. P0093 means the pump is already delivering at its limit and rail pressure still stays well below target. The leak can be external (line, rail) or internal (injector return, relief valve). An external leak is a fire hazard: stop the engine and inspect it.
- What you may notice
- Check engine light on
- Loss of power or reduced power mode
- Long cranking
- Fuel smell or visible leak
- Likely causes
- LikelyHigh-pressure line or rail fitting leaking
- LikelyInjector with excessive leak-off
- PossiblePressure relief or control valve leaking
- PossibleWeak pump or low-pressure supply mistaken for a leak
- 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.