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P04EE Powertrain

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.

Affected components

  • Fuel cap
  • Fuel sender seal
  • Evap hose tank side

Common causes

  • High likelihood: Fuel cap O-ring aged or stiffened

Possible symptoms

  • Check engine light on
  • Possible smell of fuel near tank or engine bay
  • Failed emissions inspection
  • Loose-cap warning may appear

Diagnostic notes

  • The malfunction indicator lamp may illuminate
  • This code can affect emissions

Sources

Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.

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