Ok, so I believe the Code 17 has been cleared....but I'm not exactly sure which solution clered th code. Here is what I did:

1) I originally bought a new O2 sensor that I spliced into the fitments of my oe so I took the 2 heater wires (white) and I interchanged them with one another (not sure if that made any difference since they are both the same)

2) I slightly adjusted the fuel mixture tower. There was I small steel ball in the top opening and on the side of the tower was a small hole which allowed me to stick a small hex key in and lift the ball out. The whole procedure took less than a minute.

3) I boutght a used EGR valve and replaced mine. This was a pain since my valve was pretty much fused to the damn manifold. 20+ years of heat! Once I got it off, I cleaned the area around it, scrubbed the gasket with a wire brush, sprayed the thread holes with silicone and then I decided to coat the gasket, the bolts and nuts, all the threads of the holes, and the bottom rim of the EGR valve with dielectric/anit-seize grease (highly recommended if someone has to replace their EGR or anything on the manifold)

4) I swapped out one of the EHA valves with the other one I bought.

Drove the car all day today and no CEL and it usually comes on in 30 minutes after driving, so I think I'm set.

Cheers!

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1990 190E 3.0L