Buick 2005 LeSabre Owner's Manual page 260

4. After detaching the hose from the throttle body,
pull back the entire rear portion of the engine
air cleaner/filter housing by pulling upward
and rearward.
5-20
3. Disconnect the
electrical connector
from the air intake
hose. This will allow
you to lift the rear
portion of the engine
air cleaner/filter
housing.
5. Inspect or replace the engine air cleaner/filter.
6. Reinstall the rear section of the engine air
cleaner/filter housing.
7. Reconnect the electrical connector.
8. Reattach the air intake hose by snapping it back
onto the throttle body.
9. Refasten the latches to the engine air cleaner/filter
housing cover.