Question about 2006 Chevrolet Impala

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My tighten gas light keeps coming on and now has my check engine light on. Please Help

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Take the gas cap off completely and then put back on until it clicks once.

Posted on Jul 28, 2009

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Tighten Gas Cap message, followed by the check engine light.


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My check engine light keep coming on the code was gas cap I bought one and it still keeps coming on


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Engine check light comes on and stays on for awhile then goes off. Dometimes when I fill the gas tank the check engine light comes on. is something to do with the gas cap or the instrument lights.


IF IT COME ON EVERY TIME YOU GET GAS.GAS CAP HAS BAD SEAL IT MORE LIKELY YOUR PROBLEM BUT LET AUTO ZONE SCAN IT FREE TO SEE WHAT TROUBLE CODE YOU ARE GETTING.

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The dash panel on my car keeps telling me to tighten my gas cap,


Assuming you mean the gas cap being replaced, this can also be the result of a vacuum leak. Look around on the engine and see if there are any vacuum hoses related to the fuel system. If your engine has a plastic cover it is under that. Remove the cover. Most are held down by the oil fill tube which generally unscrews, sometimes reverse threaded.

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By "Replace the gas cap", do you mean put it back on, or buy another one? If you fuel these trucks with the engine running, or don't tighten the gas cap, the light will come on. It will also come on when the seal in your gas cap goes bad. I have had to replace the gas cap on my jeep and dodge already. It fixed the problem both times.

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Check engine light comes on


HAVE IT SCAN.BUT MOST OF THE TIME WHEN CHECK ENGINE LIGHT COMES ON WHILE DRIVING AND IT DONT EFFECT ENGINE.IT COULD BE GAS CAP NOT TIGHT.A CYLINDER MISFIRE OR EVAPORATIVE LEAK.TAKE IT TO AUTOZONE HAVE IT SCAN THEY WILL DO IT FREE.

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The 1st thing to do is find out which one of over 100 codes is stored in the engine computers memory, whenever the check engine light comes on a code for that problem is stored in memory. You can go to any Auto-Zone parts store and they will run this code read test for free, then post them back here and I will help figure out what has gone wrong.

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