That is thorough, thanks. I'm used to working on OBD II with a scan tool and Volvos with OBD I. Pre-1996 Volvos allow you to also read climate control/emission control/ABS/transmission/power seat issues etc. with just the device in the engine bay. MB pre-1996 only supply engine codes? What do you do if the ABS light is on? How do you know which is the suspect wheel? What about the transmission?