1995 E320 Wagon
You can build a code reader tool with $10 worth of parts from Radio Shack. I've never seen any discussion here on pulling the codes, but there is plenty over at the peachparts MB site. Search there on "Arthur Dalton code reader" and you'll pull up plenty of threads on how to diagnose this engine.
However, like all things, the m104.980 is a bit of a mystery as its pin-out in the US is not always as described in the code reader sheets, and it appears to have a different list of valid codes.



