Well i just recently took off my turbo kit that i had on for about 3 weeks and returned my car back to stock so i could try and sell it, well i reset the ecu b4 switching it over and i drove it for about 20 min and then when i came home and let it sit for a day and then fired it back up i got a CEL and so i took it for a lil test drive and it seemed to run very good so i reset the ecu again to shut it off and took it for a test drive for about 45 minutes and both times it never turned on while driving and the again let it sit for few hours and fired it back up and got a CEL once again the CEL only comes on after im done driving it so what could be the problem maybe bad o2 censor or what i need help im stumped no leaks or anything and everything seems to run good even with the light on

 

Go to Autozone or somewhere and get the code. You should not reset the CEL without getting the code. Once you have the code you then know what the CEL is about and can get some help.