I have a 03 chevy trailblazer and i have replaced the O2 sensor 3 times. System lean comes up on engine check. What is the problem? I cleaned the throttle body, changed the fuel filter. i did notice a rattle on start up around exhaust manifold. Just frustrated cuz the trail blazer has so many sensors and i dont have a clue.
Jan 17, 2011 at 3:16 AM