Originally Posted by C.Doner

Being a euro makes it a little more difficult. Many mechanics just dont know what to do. It is meant to be tuned without the cat.
There should be a adjuster on the fuel distributor. These are set at the factory so they should not need adjustment. I did adjust mine to ear at first myself. Then I used a old smog machine to dial the AF ratio.
You could find a smog place that does repairs as well an ask them to make adjustments. You will have to tell them what to do based on what we say here.
Enrique probably doesn't want to set the AF ratio because he does not have a exhaust analyzer. A low end smog/ repair shop will do as much for much less.
There is an small allen on top of the fuel dist. 3mm. While at idle Push it in and turn very slightly clockwise until it begins to stall. Then slowly go back until it smooths back out.
You can do this at home without the exhaust analyzer. It wont be exact though. I think if you get your idle figured out you can get it tuned enough to pass. I just looked over your 2013 test and you were only failing the 15 mph test by not much. The 25 mph test was a fail but very close. Only nox was high. That leads me to think its the CAT. My car had similar readings before I replaced it.
I would find a smog place that does repairs too. It has to be a non "smog only" station. I would tell them how to adjust the fuel mix . and ask them to check the Cat. They will use their analyzer to dial you in. It should not take more than a half hour to an hour. The trouble would be finding someone wiling to touch it.
Too bad your not up north. I could hook you up to my analyzer.
Dont loose hope thats a nice Euro. It is worth getting it running. It probably has aftermarket Cats already. New ones from an exhaust shop will run 300$ or so each.