P0442: Sistema EVAP — fuga pequeña detectada
Sistema EVAP — fuga pequeña detectada: EVAP pressure decay indicates a pinhole leak (~0.040 inch / 1.0 mm equivalent) in the fuel vapor system.
| Trouble Code (DTC) | P0442 |
|---|---|
| Official SAE Definition | Sistema EVAP — fuga pequeña detectada |
| Vehicle Subsystem | powertrain |
| Driving Severity | LOW |
Observable Symptoms
- Check Engine Light illuminated
- No noticeable drivability symptoms
Most Probable Root Causes
- Worn fuel filler cap seal
- Micro-crack in EVAP vapor line or charcoal canister
- Seepage at EVAP vent solenoid seal
Step-by-Step Diagnostic Procedure
- Test fuel cap seal
- Introduce regulated nitrogen/smoke into EVAP service port and inspect underbody lines