[Eldorider]

Hi
I am not familiar with the maintence of my 95 Eldo (51k miles). Now the Service Engine Soon lamp lights up.

I tried also the instructions on http://www.cadillacforums.com/forums/showthread.php?t=2113&highlight=service+engine
but no success...
Can anybody tell me how I can access the diagnostic codes an what the codes meen? Please!

Thanks and greets, from Switzerland