OBD-II code · Powertrain (generic)
P04ED EVAP System Large Leak Detected Fresh Air Side
Same as P04EB on the fresh-air side, but with a leak large enough to prevent test build-up. The evaporative system captures fuel vapor from the tank and purges it into intake; leaks or stuck purge valves leak hydrocarbons and cause emissions failures.
Is it safe to drive with P04ED?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyVent valve stuck open
- PossibleHose pulled off or torn
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
- 0.4–1.5 h
- Emissions test
- Likely to fail
- Parts involved
- Evap Vent Valve, Evap Hose Fresh Air Side
Related codes
- P04EAEVAP System Small Leak Detected Fuel Tank Side
- P04EBEVAP System Small Leak Detected Fresh Air Side
- P04ECEVAP System Large Leak Detected Fuel Tank Side
- P04EEEVAP System Very Small Leak Detected Fuel Tank Side
- P04EFEVAP System Very Small Leak Detected Fresh Air Side
- P04F0EVAP System High Load Purge Line A Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.