just driving around town and this light came on?.. wat does it mean?.. on the book it just says loss of power and driveability .. amber light?.. anyone know what can cause this light to come on??

 

We've got tons of information on that MIL, I recommend some intense reading...grab a hot pocket and a cold one, and begin with this search I put together for you. It includes XK8/R as well because the 4.0 is common to your car as well as the older (1997-2002) XK8s.

 

See if this helps http://www.gusglikas.com/AutoRepTB.htm