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Discussion Starter #1
The local Chevrolet dealer told me the reason my car is running rough is because I need to replace my gas cap, that it is not sealing properly.
I know not having the gas cap on, or on tight can cause a trouble code.
But I have never heard of a gas cap wearing out and not sealing properly.
Any comments?
Thank you.
 

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Actually, it's probably the o-ring on the gas cap that's gone bad (dried out, cracks, etc.) Pretty much every car today will throw a code if the gas cap doesn't properly seal.
 

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Code P0457 stands for Evaporative Emission System Leak Detected (Fuel Cap Loose/Off). The evaporative emissions (EVAP) system is designed to prevent hydrocarbons (fuel vapors) from escaping into atmosphere. ... Then, when the time is right, the hydrocarbons are pulled into the engine and burned.
 
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