When you plug in the computer all it does it gives you an error code and indication were to start fault finding it doesnt tell you whats wrong you still have to be able to read wiring diagrams to diagnose the fault properly so your not guessing.
A modern mechanic servicing and replace worn parts thats the easy bit its all about being good diagnosing faults thats whats important.
It is starting to get to the point were u will have no choice but to go to the dealers because every dealer is using there own special design lead thats not compatabile with anything else there own software and there electronics is different from other dealers and thats what makes it hard for people to start up there own business.
The proper way to diagnose faults is u plug the laptop into the vehicle you get the fault code you then have to get the service manual you look up the code and then you follow the steps in the manual on how to diagnose the faults and you have to no how to read diagrams and no about electrics thats how you do it because if you look at a service manual it would shock you on how much theory there is in the book you could never absorb all that info thats why the service manual is a cruical part in diagnostics.
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