its all the time im waiting at a stop light and the card is in drive. i took it to the dealer the other day and they said its normal and i should change to premium gas if i wanted the noise gone. i dont think its normal. i also found that the front bumper doest align very well with the mud guard and checking the mud guard i noticed that it has a very very bad repair job like 3x3 cuz i can see the metal is not smooth. wtf toyota, u sold me a used car as if was new and the more time i spent with the car the more details i find.