Pontiac 2005 Bonneville Owner's Manual page 284

To inspect or replace the engine air cleaner/filter,
do the following:
1. Loosen and remove both wing screws on the top of
the engine air cleaner/filter cover.
2. Lift up the outboard side of the cover at an angle
while pulling toward you. This is necessary due to
the three tabs located on the rear of the cover.
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3. Remove the engine air cleaner/filter element and
any loose debris that may be found in the air
cleaner base.
4. Inspect or replace the air filter element.