I´ve been a happy S80 owner for two years now. There is a minor problem with the automatic 5-speed transmission. Having been braking with the engine for several seconds and pressing the gas pedal only slightly in order to keep driving with a constant speed again, the system seems to lock and continues to keep the gear direct-coupled. The only way to get the car moving with a constant speed or accelerating slightly is to give it more power. As a result I get an unconveniently hard shifting-up and ´a kick in the ass´. The head-box of the transmission has been replaced and the software updated (late 1999 versions). I think it must be a bug in which the control software doesn´t cope with following situation: transmission direct-coupled -> engine braking (-> low revs) -> soft acceleration. It seems to calculate and think of the situation for too long time, then suddenly gets awake and abruptly shifts up.

Any others with a similar problem?

I´ve tried to find the manufacturer´s website but haven´t succeeded yet (I think the model the automatic transmission box is AW-5). It would be very interesting to find out how the box adapts itself to different driving styles, how often this information is calculated and adaptive memory updated (the time span). When the software resets itself (every time the engine stops?) etc. Any sources for this information?