My friend Mike puts it best:
We did a Ctrl+Alt+Del on Matt’s car 😀
We got the OBD-2 connection to work on my car this evening. We plugged an old P75 laptop into my 98 Golf, and whadda you know, the check engine light was due to a misfire in Cyl 2 a few days ago. (I remember it now, I went into second right after starting the car while going up the hill, it was a mistake) Mike cleared the error, we ran diagnostics again, error gone.
I’m glad I didn’t have to pay the dealer to find that out.