Fuel Tank System, Check: Resetting
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2006 Volvo S80, 2005 Volvo S80, 2004 Volvo S80, 2003 Volvo S80, and 2002 Volvo S80. However, it is still accessible from the selected car via links, so may be relevant.
Reinstall the hose between the carbon filter container and evaporative emission system (EVAP) valve.
Install the evaporative emission system (EVAP) valve.
Remove the seal at the intake air hose for the carbon filter container.