OBD-II code · Powertrain (generic)
P04EB EVAP System Small Leak Detected Fresh Air Side
Same as P04EA but on the fresh-air side - the path between vent valve and atmosphere is not sealing completely during the active test phase.
Is it safe to drive with P04EB?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyVent valve does not seal in test mode
- PossibleHose 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
- 0.5–2 h
- Emissions test
- Likely to fail
- Parts involved
- Evap Vent Valve, Evap Canister, Evap Hose Fresh Air Side
Related codes
- P04E8EGR Temperature Sensor D Circuit High
- P04E9EGR Temperature Sensor D Circuit Intermittent or Erratic
- P04EAEVAP System Small Leak Detected Fuel Tank Side
- P04ECEVAP System Large Leak Detected Fuel Tank Side
- P04EDEVAP System Large Leak Detected Fresh Air Side
- P04EEEVAP System Very Small Leak Detected Fuel Tank Side
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.