They have these wonderful tools called tuning software. Lets you do all kinds of whacky shit like turn off CEL's. I pass emissions like a bauce!
Cough, cough.....you have a Gm, that's why.....cough, cough...
Yeah, I am sure that my Explorer will have a hell of a time passing emissions when I finally get around to getting her back online. That one will have to register as a show car.