Gateway Lincoln Mercury Isuzu

Charged $255.00 just to run computer diagnostic tests to find out what was wrong with my car. Service Advisor said they had to run three diagnostics at $85.00 each to find the problem. Seems to me they co find out what was wrong with my car. Service Advisor said they had to run three diagnostics at $85.00 each to find the problem. Seems to me they could have done this with one test. I will not be taking any of my mercurys back there to find out what a blinking light means. More