yuck, i have no clue what the CEL is, and couldent i say its from a thunder bird instead of a mekur? since its the same family and it came turbo charged?BAR will eyeball the whole car. Like I said, they're very thorough. They looked underneath to check the serial #'s on my CAT to make sure it belonged to a Merkur, verified that my CEL was working, verified the EGR was working and had the proper delay valve for a Merkur installed and even ran their own smog test to make sure it sniffed clean. I even swapped the label on the ECU in case they looked at the computer but they didn't pull the kick panel to check. It's a lot but it's best to do it right.