Parts for your 2003 Toyota Prius-Oil pump

2003 Toyota Prius oil pump: what it does and how to look after it

Yes, the 2003 Toyota Prius does use an engine oil pump. Technical sources that confirm this include the Toyota Repair Manual (TIS) for the 2001–2003 Prius (NHW11) in the Engine Mechanical section, which contains removal/installation and inspection procedures for the oil pump