OBD-II code · Powertrain (generic)
P04EA EVAP System Small Leak Detected Fuel Tank Side
The EVAP leak diagnostic has detected a small leak on the fuel tank side of the system - typically a hose, gasket, fuel cap, or fuel sender flange that does not seal completely. Vapor escapes during pressure or vacuum tests.
Is it safe to drive with P04EA?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyFuel cap not sealing properly
- PossibleVapor hose porous or cracked
Symptoms
- Check engine light on
- Possible smell of fuel near tank or engine bay
- Failed emissions inspection
- Loose-cap warning may appear
Repair at a glance
- Difficulty
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–2 h
- Emissions test
- Likely to fail
- Parts involved
- Fuel Tank, Fuel Cap, Fuel Sender Seal, Evap Hose Tank Side
Related codes
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.