Just as an FYI, I'm using a $75 handheld digital code scanner (OBDII) that I bought on eBay. It reads out all generic engine codes on my '98 E-class (W210). It's also been useful on a hot rod project car which has a Ford engine and computer, and I once reset the MIL (check engine light) on a friend's Acura too. So yeah, I think for the price you can get a lot of value out of one of these little gadgets. For a bit more, you can usually find a cable and laptop software solution, but I've never experimented with that myself.

Cheers, John

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'98 E300TD (W210) | Sold 6/09 with 205k and counting
'04 VW Touareg V10TDI