Always ensure the technician makes note of computer tests done on the repair order. It can certainly cause a difference if there is trouble with the vehicle later.
Diagnostic tools in the repair shop seldom find the problem. They only point in the general direction. In fact, during diagnostic tests, a significant percentage of defective electrical and electronic parts typically pass, returning "no fault found" codes even though they are defective. This makes the clueless technician’s job take even longer.
An honest, competent technician who can diagnose a problem in 0.5 hours will flag 0.5 hours. A competent but slightly less-than-honest technician may feel that he should not be penalized for being good at his job. He may flag 0.8 hours.
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