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Engine & warning lightsP0442/P0455 Codes: Small Leak vs Large Leak in the EVAP SystemThe difference between the small leak code P0442 and large leak code P0455 in the fuel vapor system, and the most common places to check.Fault codeP0455 — Evaporative emission system leak detected (large leak)P0455 indicates a large EVAP leak, often a missing gas cap or disconnected hose. Learn the causes and fix.Engine & warning lightsFuel Cap and the Check Engine Light: The Cheapest, Most Overlooked FaultHow a loose or damaged fuel cap triggers a P0455/P0442 code and check engine light, and how to confirm it yourself before a shop visit.