[Christ]

Most parts stores won't touch OBD-1 anymore, too many possible configurations and too many user-related errors w/ the scan tools and xlating codes into usable information.

OBD-2a/b is standardized, so the codes and the ALDL are all the same on any OBD-2 vehicle, which makes life easier. There is also only a master list of MIL codes, so less user error involved.

Many times, if you just google "ECU reset (vehicle year/model)" someone has already asked the question and knows how to do it.

for instance, in Honda cars, pre-OBD versions, you just pull the Hazard fuse for 10 seconds.