Powertrain
generic / SAE
P04EF
EVAP System Very Small Leak Detected Fresh Air Side
Same as P04EE on the fresh-air side - microcrack in a hose or imperfect vent valve seal at the most sensitive test threshold.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number4 / EF
Possible causes
- Vent valve seal aged high
Symptoms
- Check engine light on
- Possible smell of fuel near tank or engine bay
- Failed emissions inspection
- Loose-cap warning may appear
Inspection / repair
- Difficulty: easy
- DIY: possible
- Estimated cost: 80–250 €
- Estimated time: 0.4–1.2 h
- Component: evap vent valve
- Component: evap hose fresh air side
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012