Two problems related to engine have been reported for the 1999 Volvo S80. The most recently reported issues are listed below.
Twin turbo had to be replaced in February 2008. Not cheap. But ever since then, there has been a lack of power and very sluggish on take off and when trying to pass on the highway. Had the control valve replaced just recently, helped some, but still very sluggish. Think the Volvo dealer here have morons for service tech's.
: the contact stated the abs, traction control, check engine, and total brake failure lights illuminate at different times. There is a noise that sounds as if the abs is activating. The vehicle has not been seen by the dealership or an independent repair shop.