Gas cap was not tighten
SOURCE: Check engine light/ dash message "tighten gas cap"
I can't tell you where yours is but I can tell you how to find it. It's a plastic (sometimes metal) cylinder about the size of a normal coffee can. it has a flat vacuum fitting on the top with usually three or four hoses going to it. Normally it is located low against one of the fenders and can usually be seen easier than you can reach it with your hand. on the bottom you will see a cloth filter. If you can find something like that, you have found it.
I would also check the lines and hoses going to the fuel tank. Any leak in the vapor recovery system will show up as a cap leak which is only a part of the system. (just did one on a Pontiac GA with a similar problem)
SOURCE: The "tighten fuel cap" message
It's the gas cap sensor. Or you are getting a vaccuum leak somewhere.
SOURCE: on a 2006 chevy impala it tells you to tighten the gas cap
There is no sensor for a loose gas cap. What is happening is that the evaporative emission system is sensing a "Large Leak". Usually code p0455. The computer sees this as the most probable cause is a loose gas cap depending on several factors it looks at. You would need to clear the code(s) and see if that was the problem. If the light comes back on, then you have a problem in the system that will not let it seal. Possible solenoid problem, leaking hose / line, etc.
SOURCE: I am getting a tighten gas cap message, however
The gas cap is most likely faulty. The gas cap is an integral part of the evaporative emission system. If it is not sealing or venting properly, it can affect the proper operation of this system. I would replace the gas cap and have the check engine light reset at an autoparts store. Most stores will scan/reset computer for free. Hope this helped and best wishes.
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