The EEC systems are pretty good. Less prone to throw CEL's if something is not right. The OBD systems are much more sensitive in reading sensors relaying back information. OBD systems are much harder to trouble shoot. The OBD system will show a code for a particular sensor that's not reading right, and a lot of times it's not the sensor , but another sensor upstream or down stream in the system. You can chase your tail tracking down OBD 2 issues. Especially EVAP codes (440's and up codes) on a OBD system are difficult to diagnose, Something as simple as a loose gas cap not sealing can give you a code showing some other evap sensor or purge valve etc being the problem, when it's not. A lot more going on with the OBD systems. Is the OBD system bad? No it's not . Just harder to diagnose and trouble shoot. There is a good number of diagnostic equipment for use on the EEC systems. You could find a decent OTC Monitor diagnostic reader on ebay for decent prices. They take the little cartridges. That was what I use if I have issues on my EEC IV system. The vehicle I have is 91 Crown Vic ex-police car. I'm sure others will chime in. However, this is my practical experience with both systems.I am beginning to consider a Panther and have a few questions-- ( "sticky" Buyer's Guide would be great for other newbies). I am a longtime Ford guy, but Panther is a new car in my experience.
Rust it doesn't seem to be a major issue, but where does it begin?
EEC versus OBD2 Is there a reason to choose one over the other? Are both systems reliable?
At what mileage do major systems begin to breakdown? Engine? Trans? A/C ? other
What is essential to know about a Panther before purchasing one?