Diagnostics has become a confusing subject for most customers. This is largely due to the misconception that it's as easy as reading the code and installing a part. Vehicles are sophisticated but not to that point. The code is only a general statement of the kind of problem that has been recorded. Train technicians that can read scan data, preform flow chart test and read wire schematics needed. The part store that reads the code and sells you parts is gambling on selling you a part you may need as a way to sell more parts. That would seem like a dishonest way of doing business, but in count they said we're not charging people for the Suggestion! Tri City Auto Repair has A.S.E certified technicians train to diagnose your vehicle.