Many owners of the second generation Lexus RX have noticed a knock on the left side of the car, exhibating at speeds of 100 km/h and more. The source of the knock is at the bottom between the front and the rear seats.
The reason is a small plastic protection under the bottom, which starts to resonate at high speeds and makes an unpleasant sound. It's enough to cut the top of a couple of centimeters so she doesn't fight about the car's body, that'll solve the problem.
