Hey
I recently purchased a new 7 series key fob shell as mine was worn out, i opened both the key fobs and put the new shell on my old one.Now, the key fob is working except it won't start the car( no light on the dash it isn't taking the key at all) so i put on the old shell back and it still won't start my car but it is unlocking, locking and opening the trunk. What should i do? I really don't want to go to the dealership service department $$