2011 Toyota Venza Owners Manual - Page 558

5 -1 . Esse nt ia l inform a t ion I f noise c a n be he a rd from unde r ve hicle Approximately five hours after the engine is turned off, you may hear sound coming from under the vehicle for several minutes. This is the sound of a fuel evaporation leakage check and, it does not indicate a malfunction. 556 VENZA_U (OM73012U)