Not sure on the diagnostic charge, my Company uses them for the fleet of trucks and Van's. From my experience, they do a good job !
While we usually try to keep our prices the same across the board, there is no "one-size-fits-all" for diagnostic charges that apply to every vehicle and every problem out there. Prices may vary depending on the type of car you have and for the level of difficulty involved for finding the problem.
Thanks! Your answer is awaiting moderation.