I'm assuming the cats are the two units ~10 down the Y-pipe from the ex-manifold, that's where I expected to see the sensor. Is the section you are referring to between the cats and the center muffler?
Since it wasn't where I expected, I was unsure if MB had an alternate location for the sensor.
Bottom line, get off my tail and crawl under the car.
Thanks for your help.


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Steve Short
'91 300SE