Take your trade back, return the turd.

Dealer is right to be pissed at the BMW dealer. BUT....YOU dont want to be sitting where you are sitting!

(Why you would buy a used car with a CEL on is astonishing- I believe it is illegal here in the USA for a licensed car dealer to do so.)

I predict you spend $3000 and it isn't the ECU!

Unless PUMA is directing the BMW dealer, someone is wasting $$$. (ie You want BMW techs at the mothership directing this repair, not a local BMW tech who is 'guessing it must be the DDE, if it wont run')

Is this a PUMA case???