I had the O2 sensor discounted also. Actually installed a new one when I installed a Fabspeed cat-by-pass. No change either way...which tells me the lambda brain is not working at all. Probably will have to trace the wire for fuse #18 as Bill suggests.
Thanks to Bill I have the wiring diagrams pasted together
Charlie and I are going to trouble shoot this afternoon - also new plugs, distributor cap/roter and MAGNECOR wires, which came in last night,m will be installed.
I hope to end this CIS nightmare soon
Praying its not the lambda brain itself that is bad because a rebuilt unit from Vertes is $549
Ken