There are no diagnosticians diagnosticians and when it comes to the workshop. Several times a second best just will not do it when it comes to say electrical problem on your vehicle and a local car garage standard you will not be done and you should contact or visit a specialist or perhaps more in depth diagnostic auto repair shops in your area. Still in many cases not much auto repair shop with a big name established in your area (and generally higher costs) is even better or more experienced than the small shops but rather that they also have the tools to be more specialized and advanced, or just have time to examine this issue carefully and fully with out interruption.
Most of the tests that have been done, a lot of frustration and frustration to spend time. Those last automatic diagnostics in such heroes.

It could be argued that if any mechanic can not or do not know in essence how to find, looking for trouble and challenge the automotive, machinery and motor problems and then all in all you’re wasting their time, money and effort. Its all money and time thrown down the drainpipe. Reliability is the key. If you or your mechanic can not identify motor problems or your machine will not ultimately solve the problem fully, your vehicle will not be properly or fully repaired and eventually both you and your family will not have the driving experience a pleasant and economical. Pleasant to drive and automotive.