I've had Lexus products in the past with no rattle issues, however, my IS 250 has been in the shop 21 days with 3 unsuccessful repairs regarding 6 squeaks and rattles with a car having fewer than 3000 miles. Both left and right air vents rattle. Cheap trim around NAV/GPS squeaks, pops when ambient temperatures are above 80F/27C. Rattles in doors. Rattle in rear deck area. Moonroof rattle.
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