Ha ha! That's a heck of a thing to find. What some "mechanics" will do to fix a "check engine" light issue . Glad you got it figured out. You are correct about code 51. It could be an issue with an AC sensor or your TPS. Make sure the AC and all accessories are off when you check codes. If you still get the same thing then I would reset the codes, run the van for a few days and re-check. If that code stays gone then you're good. If it comes back, then recheck your TPS. BTW, you can check your TPS the same way you checked the Check Engine Connector (by accessing wires at the ECU). I prefer to check them this way (rather than removing the throttle body or by piercing wires). Tim