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Symptoms of a Bad Purge Valve

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The purge valve is part of your car’s evaporative emissions system, which captures any fumes from the fuel tank before they can escape into the atmosphere. The system claims these gases and burns them off in the engine at specific times through the purge valve. If the purge valve fails, it can cause a number of problems. A loose gas cap can mimic the symptoms of a failed purge valve, so check that first.

Check Engine Light

If the purge valve fails electrically, the check engine light will come on. The most common codes when this occurs are P0443 through 0445 and P0458 through 459.