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Engine & warning lightsCheck Engine Light On: What To Do First (2026)Steady light means read the code before spending; flashing means stop driving. Scan costs $0–$50, plus the common causes ranked by price.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.Engine & warning lightsWorn Engine Mounts: Clunk on Take-Off, Shake at IdleA two-minute self-check for engine mounts and how to separate them from transmission issues.Fuel & economyPurge Solenoid Valve Failure: Symptoms and Effect on Engine IdleUnstable idle and check engine light with code P0441 or P0446? Diagnosing the purge solenoid valve and repair cost.Engine & warning lightsCode P0420: Read This Before Buying a ConverterAn exhaust leak ($60–$200) or a lazy rear O2 sensor ($120–$350) throws the same code. Cheapest-first checklist.Engine & warning lightsDashboard Warning Lights: Which Mean Stop Now?Red means stop, amber means check soon. Table of common lights with the real risk level and repair cost for each.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 lightsCooling System Pressure Test Explained: Finding Leaks Your Eyes Can't SeeA step-by-step explanation of radiator and hose pressure testing, and why it beats a visual check alone at finding slow leaks.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.