Great forum for technical information.
I ran into a mechanic challenge for the experienced tech on my 1985, 500SEC Euro.

After reading a lot about checking for the the closed loop setting I purchased a recommended Sears multimeter to check the lambda settings and closed loop settings and discovered a small problem after the readings made no sense. The more I looked at #3 location I could see no metal female connector. So a popped off the plastic retainer and sure enough there was no pin connector in the #3 location. Even though a European car, it seems odd #3 is missing. Is there a color code on the pin wires I can defer in case there was a musical chairs on the pins? Pin #2 does appear to be a ground by resistance check.

The X11 connector on the left fender has no wire on the #3 terminal slot

I hope the attachment works as the missing #3 is visiable.

Thanks

Kurt

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