Your biggest problem is the year of your car, as it's an oil burner, it does'nt have to comply to the EOBD standard untill 2004, so any of the generic readers on ebay might not work on your car, but if the reader has an ELM 327 chip it stands a better chance of working, and on many other vehicles, ideally you would use the Vauxhall clip 2 reader, there is a company Grendon diagnostics, they sell Vauxhall specific readers
nigel
August 2010