Fuel tank system, check: Resetting
WARNING: This page is about a different car, the 2004 Volvo S40, 2003 Volvo S40, 2002 Volvo S40, 2001 Volvo S40, and 2000 Volvo S40. 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.