well i took my 95 mustang to a Transmission palce to get it fixed. and since then i have gotten the "check engine" light. the dude used the computer and said there is no errors. but he believes that its something to do with gas. like i forgot the exact words he said maybe it was "c02" or idk just basically i need to buy something new. does nebody know what in the world this could mean? and if u do, how can i fix this gas problem?
thx -djTuner

 

If they dropped the transmission to work on it, I assume they took off the H-pipe as well. It's probably something to do with the o2 sensors that are hooked up to the H-pipe.

Either one got fucked up or it's not connected right

 

Reset the ECU and see if it goes away. If you're getting a CEL, there is a reason and there is a code that's causing it. I'm guessing they probably fucked something up and don't want to admit it, because this is too much of a coincidence.. Transmission work should not affect anything by itself, unless something was inadvertently damaged.