Great thread, but I've got a question... My father just picked up a 97 850 glt wagon. It had a CEL for our favorite code here. I tried to do this mod, and I am having an issue.
I soldered the diode inside the ECU, unplugged the air pump, and cleared the CEL. Now I am getting a CEL, but when I plug in my scanner, there are no codes registered. Cleared several times, but when I shut off and turn on the car. The light comes back.
I did this mod to my 98 C70 about 20k ago without any issues. Any help here....am I missing something?