Fitting Bolts And Nuts
WARNING: This page is about a different car, the 2013 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
Inspect the installation bolts and nuts of the oil pump and bracket for looseness, and retighten them if necessary.
NOTE:
Inspect and/or retighten the bolts and nuts when the engine is cold.