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There are several reasons for the light to come on. About 500 to be exact. If the car is driving normally then that does usually indicate a problem with the evap emissions system. The thing is that system is made up of several parts, so without the stored code it's difficult to know where to begin to look for the problem. The gas cap is a good place to start, but if it's tight then usually one of the other components is causing the problem. Most of the larger parts stores like Autozone will usually check these codes for you at no charge. If you want to go that route and then post the code with me, I could certainly give you more details into the cause of the light. The car is safe to drive as long as it's driving normally.
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