Diagnostic connector. I have a 1997 970 with the same location of the diagnostic plug. Mine is a OBD II, as I believe all cars of this vintage is. The protocal is mandated by some agency of the government, and all cars sold in the US have to meet these requirements. As for the garages not being able...

Am new to the forum. Great stuff in here! My question concerns the OBD discussion. I just stopped driving a 1990 740GL which had this system. I searched around the net 6 years ago when I acquired the car, and found an outfit "Alldata" that has subcriptions for tech. specs on a lot of vehic...