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[terry paget]

It is pretty much impossible to put a system in place that detects loss of a ground connection and reports a trouble code associated with it 

Thank you. That leads me to wonder whether, had I got a man in to sort this car out, as suggested by DG and STEMO, he would have fared any better. I imagined that a Vauxhall dealer 'expert', with a superior diagnostic device, could simply plug it in and read out the fault.

[Marks DTM Calib]

It is pretty much impossible to put a system in place that detects loss of a ground connection and reports a trouble code associated with it 

Thank you. That leads me to wonder whether, had I got a man in to sort this car out, as suggested by DG and STEMO, he would have fared any better. I imagined that a Vauxhall dealer 'expert', with a superior diagnostic device, could simply plug it in and read out the fault.

Ah yes, a common misconception.

There is no diag kit on the planet that can tell you what the fault is, it can only tell you the symptoms 

It requires a level of care and thought to analyse the symptoms, carry out checks and determine the fault.....

.......and there in lies the problem, mechanics have little understanding of the systems and hence, if its not been seen before or is obvious........willy nilly part changing occurs and the bills sky rocket.