P0442
System
Powertrain (Emissions/EVAP)
Scanner som krävs
Enhanced OBD2 scanner (live data graphs, freeze frame, battery voltage test)

EVAP System Leak Detected (Small Leak)

Understand P0442, common causes, and the right FOXWELL scanner to diagnose it.

The evaporative emissions system detected a small leak. Common after a loose or missing gas cap, but can also indicate cracked EVAP hoses or a failing purge valve.

Vanliga symptom

  • Check engine light
  • Fuel smell near the vehicle (larger leaks)
  • Failed emissions inspection

Typiska orsaker

  • Loose, missing, or faulty gas cap
  • Cracked EVAP hose
  • Failed purge or vent solenoid
  • Leaking charcoal canister

Vilken scanner behöver du?

Enhanced OBD2 scanner (live data graphs, freeze frame, battery voltage test)

Använd live-data och freeze frame innan du byter delar. ABS-, SRS- och U-koder kräver oftast en fullsystems-scanner.

Diagnostiktips

  • Spara freeze frame när koden först sätts
  • Rensa koden först efter att orsaken är åtgärdad
  • Kontrollera relaterade väntande koder
  • Verifiera batterispänning över 12,4 V innan du misstänker sensorer

Rekommenderade FOXWELL-scannrar

Vanliga frågor

Can I diagnose P0442 with a basic code reader?
P0442 may set in the engine module, but related diagnostics often benefit from an enhanced or full-system scanner with live data and freeze frame.
Is it safe to drive with P0442?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.