@ Ground Rush
What you write is sadly too true. I had an experience a few years ago with an 'Authorised Dealer' who charged 70 quid for *not* being able to diagnose a fault in my car. The "technician's" conclusion was that the engine and transmission were both knackered, repair/replacement would hurt to the tune of 10 grand. I had up to that moment not realised that 'knackered' was a technical term for : "I don't know how to operate the diagnostic tool, so I will never know what the issue is. However for forty grand you can buy a new car from us instead. That'll be 70 quid, thanks."
Needles to say I left the premises rapidly, got a 'second opinion' from an experienced 'old hack'.
He asked me to start the engine. He listened. He asked me to stop and start it again. He listened. Without even lifting the bonnet (hood), he diagnosed a faulty fuel injection pump.
It cost me a replacement pump (three hundred quid+labour), but 260,000 km later it is still going like the clappers. I am still trying to get my 70 quid back from the high-tech 'Dealer'.
Now I do my own diagnostics, or get a semi-retired mech to take a look.
Wow, this is really going off topic...
Paris, to bring it back on topic.