Emission Control System: Inspection

WARNING: This page is about a different car, the 2007 Lexus ES 350. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT FUEL TANK CAP ASSEMBLY
1. Visually check if the cap and gasket are deformed or damaged.
  If necessary, replace the cap.
  
  Fig 1: Identifying Fuel Tank Cap Assembly
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002