One problem related to speedometer/odometer failure has been reported for the 1999 Volvo S70. The most recently reported issues are listed below.
The throttle will flutter and the accelerator will cut out when pressing the accelerator pedal as well as vibrate. The vehicle stalled/died and lost power. The problem was fixed in February 2004, but it recurred. When the cruise control fails the odometer fails as well. The abs and brake light illuminated as well.