Aha! The code fault table I used was the one Authur Dalton had posted, and I wondered if perhaps it was for different models, but couldn't find anything else. This is a big help.

A failed O2 sensor makes sense. I had just put nearly $2,000 into the car, and got "penny wise and pound foolish" on the O2 sensor I put in. I found it on ebay for a low price and got what I paid for. I now have a new original on the way.

Thanks for pointing me in the right direction.

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2000 Mercedes S500
1990 Mercedes 560SEL
1970 Triumph Spitfire