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Check engine light 1997 buick skylark

Gas cap was not tighten

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After you tighten or replace the gas cap , the check engine light will go out on its own after you drive for a while. if it dosent you will need a code reader to see what other problem you have. hope this helps you

Posted on Jun 28, 2014

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Posted on Jan 02, 2017

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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)

Posted on Mar 22, 2009

Hightower971
  • 183 Answers

SOURCE: The "tighten fuel cap" message

It's the gas cap sensor. Or you are getting a vaccuum leak somewhere.

Posted on Apr 24, 2009

Tech jk
  • 102 Answers

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.

Posted on May 08, 2009

canbruce75
  • 1776 Answers

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.

Posted on Aug 07, 2009

  • 2926 Answers

SOURCE: tighten gas cap message, check engine light is on

Replace the fuel cap.

Posted on Jul 10, 2010

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