Opcom allows you to read/clear fault codes, view live data, perform actuator tests, program keys, reset service lights, and even code certain ECUs (engine, ABS, airbag, etc.) on most Opel/Vauxhall models from ~1996 to ~2014.
If you own a Vauxhall or Opel vehicle and want to perform your own diagnostics, programming, or service resets, you’ve likely come across the term "Opcom." An Opcom tutorial typically refers to step-by-step guidance on using a third-party diagnostic interface compatible with GM’s Tech2 software (often called "Opcom" or "Vauxcom"). opcom tutorial