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Q: how much will it cost to replace the Evaporative Emission Vent Valve Solenoid on 2002 Oldsmobile Silhouette

the engine warning light keeps coming on. I can reset it by disconnecting the battery for a while and the car will run for a few days and then the light comes back on. The car runs perfectly even when the light is on. The error code is P0449 GMC
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