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P0455
System
Powertrain (Emissions/EVAP)
Scanner som krävs
Basic OBD2 code reader (engine codes, live data, smog readiness)

EVAP System Leak Detected (Large Leak)

Understand P0455, common causes, and the right TOPDON scanner to diagnose it.

A large leak in the EVAP system was detected — often a gas cap left off after refueling, but can also mean a disconnected or broken EVAP line.

Vanliga symptom

  • Check engine light shortly after refueling
  • Possible fuel vapor smell

Typiska orsaker

  • Gas cap not tightened or missing
  • Disconnected EVAP hose
  • Damaged filler neck
  • Failed vent valve

Vilken scanner behöver du?

Basic OBD2 code reader (engine codes, live data, smog readiness)

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 TOPDON-scannrar

Vanliga frågor

What does P0455 mean?
P0455 indicates evap system leak detected (large leak). A large leak in the EVAP system was detected — often a gas cap left off after refueling, but can also mean a disconnected or broken EVAP line.
Can I diagnose P0455 with a basic code reader?
Yes — P0455 is typically accessible with a basic OBD2 code reader like the TOPDON ArtiDiag201 or TopScan Lite. Live data helps confirm the repair.
Which TOPDON scanner do I need for P0455?
Basic OBD2 code reader (engine codes, live data, smog readiness) See recommended tools on this page.
Is it safe to drive with P0455?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.