Title fuel cap and checking michis lights keep coming on and going off what could be the problem Accra 2000 tl
The gas cap is a part of the vehicle’s evaporative emissions system and can cause problems with the system if it has an issue. An improperly sealing fuel cap may cause an evap system leak, which will set off the Check Engine Light when the the computer detects the leak. The Check Engine Light can also be set off by a wide variety of other issue so having the computer scanned for trouble codes is highly recommended.
A bad or failing fuel cap will not necessarily cause major performance issues, but it can set off the Check Engine Light, which will prevent the vehicle from passing an emissions test. If you suspect that your gas cap may be having an issue, have the vehicle inspected by a professional technician.
When the car starts, the EVAP system runs a test, by introducing a vacuum in the gas tank to make sure there are no leaks. If the cap isn't screwed down all the way, air can get around the seal and the system will think there is a leak, so the CEL will come on. Replacement gas caps are inexpensive at most auto parts stores if you need one.