Hi all, I have an Op-Com for the wife's Vectra problems, and I got one of these Chinese "ELM327" OBDII interfaces for my VZ (CAN OBDII protocol : ISO 15765-4 CAN (11 bit ID, 500 kbaud))
About US$20 delivered in less than 2 weeks.
Diagnostic Code Reader CAN-BUS Car interface OBD2: eBay Motors...