Which code reader will my 1992 300SE use the OBD I or OBD II? Which model would you suggest? Just looking for a DIY model not a professional one.

OBD I. OBD II started in MY 1996.

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1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member

Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'

There are only 10 kinds of people in the world--those who understand binary and those who don't

E320 16 PIN DTC Charts inc. pin 8, pin 14

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A Dalton

Thanks guys!!!

Aurher - I will go ahead and try to build my own however, I've seen two renderings of the drawing. One has a 0.5 amp fuse and fuse holder on the yellow lead and one does not. How important is the fuse and what is it protecting?

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Some put it there for polarityprotection, but it is not needed b/c the diode is foward biased ..so it can not be hooked up wrong and if the diode opens , there is no circuit.
If you want it , put it in the pos side of the circuit.

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A Dalton

Arthur - Thanks for the fast reply and sorry for butchering you name!