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I have a 2008 Chevy Impala (50th Anniversary edition) and there are times when the service engine light will come on and the dash will say tighten gas cap. So I tighten the gas cap and the light stays on. I know it's not the gas cap (which I have replaced) because it's tight. Is there a sensor or air vent that is getting dirty?

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Mark
 

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8th Gen Antagonist
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There is an EVAP canister vent solenoid behind the filler neck, take it out, clean it up, and lube it.
 
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I have a 2008 Chevy Impala (50th Anniversary edition) and there are times when the service engine light will come on and the dash will say tighten gas cap. So I tighten the gas cap and the light stays on. I know it's not the gas cap (which I have replaced) because it's tight. Is there a sensor or air vent that is getting dirty?

Thanks
Mark

When you say that you've replaced the gas cap, what did you replace it with? Did you go to a auto store? You need to go to the dealer, supply your VIN, and get the EXACT gas cap for it.

Source: Spent $800 replacing valves and sensors only to realize the gas cap I bought from the Auto store was bullshit.
 

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I replaced my gas cap with a locking gas cap from Canadian Tire, so that no one can suck out my precious fuel. It works fine, but a couple of times I got that 'gas cap loose' message and it was because the cap wasn't locking properly. I think it needed lubricating, but it works fine now.
 
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