P04EAEVAP System Small Leak Detected - Fuel Tank Side
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- Hybrids with a sealed fuel tank have a valve separating the tank from the charcoal canister and its vent side. CARB allows such sections to be leak-checked separately with their own codes; a Ford patent checks the tank side via tank pressure with the valve closed and the canister side with a leak check module. Conventional systems report the same leak as P0442, P0455 or P0456. P04EA reports a small leak (0.040 in) in the tank section – tank, filler neck, cap and lines up to the tank valve. No manufacturer document available to us names this code; the description follows CARB and the Ford patent.
- What you may notice
- Check engine light on
- Possibly check fuel cap message or slight fuel smell
- No change in driving
- Likely causes
- LikelyFuel cap or seal leaking or not closed properly (tether trapped)
- PossibleFiller neck or tank vent line leaking
- PossibleSender or pump flange seal leaking
- RareTank valve or tank pressure sensor faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €20 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.