I am having problems with my astra juddering and loosing power randomly. I called my local vauxhall dealership only to find out they charge £105.75 for a 1hour diagnostic check. But they still cant guarantee to find the correct fault which is really s**t.
I have therefore decided to buy either opcom or tech2 and try and determine the fault myself as I am confident it must be a valve or sensor. I know nothing of them other then that I will need a laptop, software and cable/adapter. I am reasonably computer literate so running the software shouldn't be an issue but im not sure which is the better to buy and where best to buy it from?
There seems to be over 100 of these available on ebay as well as other online retailers and would appreciate a point in the right direction.