Parts for your 2003 Toyota Bb-Oil seals

2003 Toyota bB oil seals — what they do and when to replace them

Oil seals are absolutely used on the 2003 Toyota bB (NCP30/31/35). Toyota’s factory Repair Manual and Electronic Parts Catalog list multiple seals for the 1NZ‑FE/2NZ‑FE engines and the transaxle, including the front crankshaft seal, rear main seal, camshaft seals, timing cover sealing, and driveshaft (axle) oil seals. These same components are also documented in Scion xB (the bB’s export twin) service literature and Aisin/NOK application catalogues for Toyota compact platforms of this era.

On a 2003 bB, oil seals keep engine and transmission oil where it belongs while allowing rotating parts to spin freely. The front crankshaft seal keeps oil inside the timing cover area