Hi Steve:

I tracked the wire from the O2 sensor and it goes to the big computer style connector (its taped into it with electrical tape so they spliced it in there I suppose) that plugs into what I presume is the computer of the car behind the battery on the wall. Its a big rectangular black box with the printer cable style connector plugged in the top of it.

In front of the battery, on the back of the firewall, I only have one connector which goes to the brake pad sensor to light when the pads are gone. So, no diagnostic connector at the passenger side.

I guess I really have one of the first versions of the 190e and it seems to be alot simpler than the others here. I have that screw to adjust the idle speed, the mixture adjustment screw, the added O2 sensor spliced into the computer, and no pin 3 connector in the X11 hole #3.

What would be the best course of action now? That O2 sensor was installed in 1986 by the way so could it still work or is it faulty by now? Its only seen about 90k miles since it was installed (I have 120k miles on the car) but many years of living in that exhaust pipe...

Thanks for your help, as always, it is much appreciated!

-=>Raja.

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1983 MB 190E, bought from Germany and shipped to the US in 1986.