I'll second that the wiring harness isn't a big deal.

The big deal is if the a/c needs work, especially evaporator.

Don't be put off by dealer willingness to sell it cheap--there's nothing more obsolete than a previous model S-class and their resale values reflect that.

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Kent Christensen
Albuquerque
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
Two BMW motorcycles