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Fuel & economyEVAP System Faults: Fuel Smell, Code P0442, and Repair CostFaint fuel smell and check engine light with an EVAP code? A guide to diagnosing the evaporative emission system.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 codeP0442 — Evaporative emission system leak (small)P0442 is often just a loose gas cap. Learn the other possible causes and realistic repair costs.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.