OBD-II code · Powertrain (generic)
P04EE EVAP System Very Small Leak Detected Fuel Tank Side
Same as P04EA but at the most sensitive leak threshold - typically the OBD-II 0.020-inch (~0.5 mm) test. The system holds pressure for some time but loses it slower than the diagnostic limit allows; usually fuel cap O-ring fatigue or microcracks in a hose.
Is it safe to drive with P04EE?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyFuel cap O-ring aged or stiffened
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
- 0.2–1 h
- Emissions test
- Likely to fail
- Parts involved
- 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.