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Somebody will probably step in and confirm or tell me i'm talking rubbish, but i don't think this will work on the 638 (can't comment on 639) simply because it's the wrong shape, the connection on the 638 is a round connector under the passenger seat.

I'm pretty sure you can get adaptors right enough to convert round to square, but then i't gonna add to the cost and you'd be better off just buying the correct machine.
 

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Zenedge, Your Wrong and Right!

pre 2000.5 had the Round 38 pin plug > then onward had the EOBD style 16 pin Diag plug!

The correct machine for Diagnostics would be a MB Star C3 ( Which I have ) at a cost of a few grand!

This will work in some aspects but will be vary vague! and you'd spend ages makin it work with software etc! Your better off with a small hand held device ( Launch CR, Snap on Ethos etc )

Mark
 
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