NOTE: new address!!
Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.)
Is it the light that says "SERVICE" or the light that says "CHECK ENGINE"
there is a major difference between them.... Service is a reminder that can
be turned off by pressing the button under the little rubber nipple, the
other one means there is a problem with the car.
On my 1990 740 I remove the number #1 fuse (controlling the fuel injection
system), and have it out for about 5 seconds before replacing it. Probably
the same for your car.