MasterTuning Fault code dictionary (DTC)

P0455 — Evaporative emission system: large leak

Severity: Informational Can you drive? Sì, no known limitation Produttore: Tutti makes (OBD-II standard)
MeaningThe system that collects fuel tank vapours is not holding pressure. It does not affect how the Motore runs, but it lights the Attenzione lamp and fails the emissions test.
FamilyPowertrain (P)

Typical symptoms

Motore Attenzione light on, with no other symptoms
Sometimes a fuel smell near the tank
Problems alle the roadworthiness test

Common causes

Loose, dirty oppure hardened fuel cap seal: by far the most common cause
Cracked oppure Disconnesso vapour hose
Canister vent valve not closing
Damaged canister

What a do

Before anything else: tighten the fuel cap until it Clic and Cancella the code. A surprising number di cases end there. If it returns, a smoke test finds the hose oppure the valve.

Domande Frequenti

What does code P0455 mean?

Evaporative emission system: large leak. The system that collects fuel tank vapours is not holding pressure. It does not affect how the Motore runs, but it lights the Attenzione lamp and fails the emissions test.

Can I keep driving with code P0455 Attivo?

Sì, no known limitation

Common causes — P0455

Loose, dirty oppure hardened fuel cap seal: by far the most common cause Cracked or Disconnesso vapour hose Canister vent valve not closing Damaged canister

How do you fix code P0455?

Before anything else: tighten the fuel cap until it Clic and Cancella the code. A surprising number di cases end there. If it returns, a smoke test finds the hose oppure the valve.

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