I have a 94 S500 and the check engine light and a few other lights are on, What do i need to read these codes and where is the diagnostic port on this car?

 

Suggest:
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Either use a test light especially made for computers and electronics, with short piece of wire or paper clip, and one by one test the pins of the 38 pin test connector, in accordance with procedure. I got tired of using a test light and a paper clip, so I finally bought below, which is applicable to your car also:
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ih=008&sspagename=S TRK%3AMEWN%3AIT&viewitem=&item=18005349166 4&rd=1,1

On these model MB cars, you need to check the computer codes regularly, and clear them after fixing problems.

Send an email to wmercer@***.net and I can further provide info on my experiences.
bill

 

yeah, it has a fun 38 pin round connector under the hood instead of a 16pin dlc under the dash. really nice if you have an SDS, really a pain if you dont.