Pull fuse #1 (engine off) for 30 seconds or more then refit it.
Take it for a test drive and note when/if the EML comes back on.
Mark is absolutely correct, it's a "not-quite-OBD" port on the 940s and will only work with a dedicated code reader - or a 12V LED (NOT a bulb!
) and a piece of wire but you need to know where to plug it in, which is the reset line etc - Lokis reader does the hard work bit of this in a conveniently fully built/tested package with an OBD plug on the end
No, the mechanic can't read it with his stuff either.