Help with my truck

Why reasons turn on the check in my Chevrolet Trail Blazer truck ???? I explain there were 2 coinside that I dech as possible causes 1 tube to change the biscostatic clutch ami truck 2 robbed the gas lid even though I already put a new one could be some of them the cause of which the light is tested ??? And if the BrisStatic clutch affects emissions ????

The Check light only turns on when some component of the injection system is defective, the viscoso does not pass through the computer, but if they had to release something more of the system can only see something disconnected and nothing else. Neither of the two factors you mention influences Check Engine