Got a SES light about 3 months ago. I put on an asp underdrive crank pulley and dropped my idle down to like 500rpms which is making the exhaust have a low low vibration cauing th y pipe to come completely loose...now here the question..would have the exhaust leak cause the 02 sensors to dump for fuel and make me run rich and burn out the 02 sensors and cats? And when I say leak the y pipe is just interlocked not even tightned up once it gets loose.

 

Need to get it scanned, find out what the code is.