"The main batch of cars, produced after week 40 of 1994, had emission code 0." http://www.volvo850t-5r.com/about-the-t-5r/volvo-850-t-5r-vehicle-identification/
Mine was built July '94. Week 40 isn't until early October. The chassis code range for all known T-5R estates is 078000-171000, and mine is 078626. There is also a ton of crazy stuff going on with this car that is documented better in my thread on SS. For example, the walnut on the console doesn't quite match the walnut dash, I am speculating because they didn't have the finish worked out yet. There is no 213 relay for the fog lights (they're hardwired) and the fog light wiring does not follow the proper path, not sure what that means but it's definitely not the way things were done on the production line. It also wasn't imported to the states until December '94, so what exactly it was doing for those first six months is also a good question.
That's the story with my car. I am told that there are one or two T-5Rs in Australia that have a similar thing going on but I don't know the full story of those cars.
I know there were a lot of different option packages around the world that we didn't get here. I'm speaking in terms of the option packages that you could spec in the states since we are dealing with California market cars here.