The perception part is what I'm talking about. They perceive that a $90 code scanner used by a parts guy will be all they need to find out what is wrong with their car. Because of that, a lot of them also perceive that an honest garage with thousands of dollars in scan tools, info system access , and testing equipment, not to mention qualified techs with lots of training, is ripping them off by charging a testing fee. True, there is some of them that you can talk into paying the fees and turning them into loyal customers. But we don't install the parts that the parts store said they need. When it doesn't work, they are not happy that it didn't fix their problem. You offer to diagnose the problem, but then they find out there is a testing fee, and you're ripping them off twice! Once for installing the parts and now you want to charge for testing! I think you need to set some boundaries and keep the "converts" and send the rest down the road. They wanted a cheap way out and that not the customer you want.