Jeff Savage decided to add:

Replace the Electrical Relay in the dash behind the Ash Tray.

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940 gl 1990 auto
245,007

Greetings all,
I have a 93 model 940GLE, automatic, 222,000km.  Of late, the overdrive unit
does not always re-engage after I have pressed the button to overtake
(taking it out of overdrive), when I press the button again to re-engage
overdrive it doesn't want to go back again.  The button can be pressed
repeatedly to no avail.  Some minutes later it may decided to re-engage all
by itself.  There has also been a couple of occasions in the last six months
when I have started the car and the arrow has come up saying the overdrive
is disengaged and the only fix (I've tried driving it) is to turn off the
key and start again.

Any thoughts would be useful.
Thanks heaps Jeff

Sounds like your overdrive relay is going out.  It is located behind the
fuse panel.  They typically have a problem with cold solder joints.  If you
are handy with a soldering gun you can repair this yourself, by reflowing
the solder joints
on the wafer board inside the relay.  If not they cost about
$40 to $50 dollars from the dealer.

Harold