Volvo 2008 S40 Owner's Manual page 193

Low beam bulb
1. Open the hood.
2. Remove the headlight housing.
3. Remove the wiring connector from the bulb.
4. Release the bulb's retaining spring by pressing it inward and downward.
5. Pull out the bulb.
Installing a new bulb
1. Insert the new bulb. It can only be inserted in one position.
2. Press the retaining spring inward and upward and slightly to the right until it snaps into place.
3. Press the wiring connector onto the bulb.
4. Put the plastic cover in place.
5. Reinstall the headlight housing.
High beam bulb (halogen)