On a number of occasions my engine light has turned on because my gas cap has not been secured tightly. Last night it turned on again, I immediatly pulled over, checked the gas cap and found it too be very loose. I am 99% sure its the gas cap, I do not want to run a diagnostic on it and be charged whatever the price is. (I think its 50$) Any opinions? What is the procedure on turning off the light? If there is a real problem will the light turn on again after I turn it off? Thanks

 

Go to Autozone and get the code pulled for free. Then you can reset the light without wondering if it was the actual problem.

Reset instructions are in the FAQ

 

It should go away after a tank or so. Just make sure its tight from then on.

 

Without the code you are guessing. Get the code 1st.

 

Some people just disconnected the battery which is not a good idea but it will do the trick. The best way to reset your ecu is to pull out the back-up fuse. Just locate the fuse box.....look and see the ones that say "back-up"...pull that fuse out for maybe 15-30sec i guess...and then put it back in and you are done.