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P0455
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Powertrain (Emissions/EVAP)
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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.

Veelvoorkomende symptomen

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

Typische oorzaken

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

Welke scanner heb je nodig?

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

Gebruik live data en freeze frame voordat je onderdelen vervangt. ABS-, SRS- en U-codes vereisen meestal een full-system scanner.

Diagnosetips

  • Leg freeze frame vast wanneer de code voor het eerst verschijnt
  • Wis de code pas na het oplossen van de oorzaak
  • Controleer op gerelateerde pending codes
  • Controleer of accuspanning boven 12,4 V is voordat je sensoren suspecteert

Aanbevolen TOPDON scanners

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Veelgestelde vragen

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.