In all trades there are those who have sufficient product knowledge to successfully repair a good percentage of the jobs they have been allocated and make a good living. They tend to cover their inadequacies when faced with a problem that they are not familiar with by blustering about how all that model/make are crap and they don't usually touch them or refuse to accept the task due to not being trained on that model. When pushed into doing the task it may well become one of those horrible units that are best resolved from a service manager's perspective by replacing it.
I've seen this attitude from when I started my electronics trade in 1982 all the way through to my current role as an IT Architect.
A small percentage of techs are able to apply methodical troubleshooting techniques to a problem and methodically work through a problem to find the root cause and resolve it. Unfortunately the commoditisation of goods has often made labour costs worth more than a good repair and the dumbing down of the repair process and withholding of the knowledge on how a system actually works makes this approach difficult and expensive.
When I started in electronics we used to replace the heads in video recorders and spend time with a CRO aligning them, eventually video recorders were worth about 2 hours labour.
Cars are no different with all the repairs of the "hard bits" such as electronic systems being a swap it till the problem goes away solution and the dealers unable to repair at a deeper level even if they want to.
When you find a competent mechanic understand that his time is worth money and a proper fix takes time sometimes. The others will never change and are best left to swap the pile of spare parts that they have ordered on someone else car.
Interestingly a lot of the people that I run into that are capable of proper fault finding are ex military types, not sure if that's a Canberra thing or if they are still trained the way I was by an old fashioned tradesman in an atmosphere where sufficient time was available to do repairs properly. A lot of the government institutions that used to train apprentices to actually fault find and repair do not exist anymore, Telstra is privatised, electricity commissions no longer exist etc.
Regards,
Tote
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