An OPCOM (Opel Communications) scanning device is the most commonly owned diagnostic kit among DIYers. Sold at a low price point (less than £40 at the time of writing), the system supports many control units, including engine, automatic transmission, ABS, airbag, engine cooling module, instrument cluster, electronic climate control and body control unit. “OPCOM is an OBDIIcompatible fault code reader comprising an interface module, USB lead and software on digital download or CD,” says MWP boss, Marc Wale. “By connecting the device to a Windows-equipped laptop, you can view live data, fault codes, perform output tests and carry out basic programming, such as setting idle speed, extinguishing air bag lights and coding extra keys.”
Suitable for Vauxhalls built between the mid1990s and 2010 (Omega B through to Astra H), variations on OPCOM’s basic design can be purchased from a variety of suppliers, but bear in mind you’re investing in an unofficial product. Speak to owners already using OPCOM to ensure the version you’re about to buy has been tried and tested without complaint.