Help! I just recently purchase a 2004 XLR company car with 3100 miles. 2 weeks ago. the car runs great. I had corsa pipes installed at the caddy dealer, and that night the check engine light came on. i returned to the dealer next morning and the replaced and ox sensor. also i noticed exhust rattling, and the elimanated that. 1 day later the check engine light came on again. I am not use to this many problems out the door with a car. This is my first Cadillac. Is there a way to turn this light off?