The check engine light goes on for a few seconds with KOEO so that's working OK. Check engine code has not turned on with a fault. With KOEO the O2 sensor (backprobed) only shows a couple mV. I would expect .45V I thought would be priovided by the computer. The O2 wire to terminal #8 on the CIS is Ok (I ohmed it and wiggled it) so the O2 signal should be getting to the computer.

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1972 450SL
1982 300D Turbo