One:Not confirming the concern. To fix a problem, the first thing one must do is recognize it. Two: Insufficient Road Testing. Many technicians consider driving the vehicle into the shop a road test. Three:Misdiagnosing. Mechanics will spend hours chasing the wrong problem, wasting your time and money. Four:Throwing parts at a problem. To compensate for lack of skills, this goes right back to mistake number one: confirm the problem with diagnostics, then proceed. Five:Not addressing primary concerns first. Technicians often spend an inordinate amount of time looking for easy sells that will fatten their paychecks. Six:Overconfidence. Too often unqualified technicians get in over their heads. The road to hell is paved with good intentions? Seven:Taking shortcuts, technicians create a host of problems. Eight:Poor Repairs. Whether through incompetence or just lazy,worse with computer repairs, incorrect software programming, coding. Nine:Not confirming repairs solved the problem. Ten:Making a mess. If the above nine mistakes weren’t bad enough, there are now greasy fingerprints on the hood and steering wheel, and two big greasy boot marks on the carpet.