The check engine lighr comes on & stays on at 69k mikes- Iver tightened the Fuel cap.. Whats happening ?

Check engine light comes on with faulty oxygen sensor, loose gas cap or faulty gas cap. sometimes with low octane fuel as well. fill up with high octane fuel, tighten down the cap and see if it helps.

anything is possible, check codes...

The fuel cap needs to be tight or it will set a code. It's a pressurized fuel system. Try to tighten snug the code should clear itself. If this does'nt work exchage the fuel cap, it may not be working properly.

The metal flap should not trigger the sensor. Once you tighten the gas cap you should clear the code and see if it comes back. Otherwise it will take a while to go away.
If it does come back even though the gas cap is tight it could be the rubber seal around the gas cap replacing that can sometimes fix this issue also.

check the motor motor mounts for movement,
watch how far engine rocks forward or back with it running and foot on brake

The most common cause of this is the gas cap not being tightened completely after re-fueling or a worn rubber gasket on the cap.Remove the gas cap and turn it over and check the gasket if it looks like it's not worn put the gas cap back on and then tighten it until it clicks several times, then it make take a little while before the check engine light goes off. If this still happens shortly after tightening the gas cap have the check engine code read at an Automotive Parts store. Some stores have the code readers and they'll get what the code means and advise you at that point.

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

find someone with a scaner and find out whats really going on with out fault code its kind of hard to know whats going on

Good Day,

Sounds like your fuel cap needs to be replaced, there is a rubber seal in there to which keeps fuel pressure up, when this seal goes bad you get a drop in pressure and your engine light will come on. Replace the cap with a new one. As far as your lighter ports that is probably due to a blown fuse and unrelated to the fuel cap issue.

Hope this helps

look under the back end of the car where the smaller lines come off the fuel filler neck look for any broken, dissconnected,or rusted lines, or sensors follow these lines back to the fuel tank and up to the front of the car and under the hood repair as needed good luck and please rate -jeff