I am having the same problem with our 2013 Lexus, have taken it in several times, they put in a new charcoal filter (have had the car for only 6 months), and took it in again yesterday, they keep telling us they do not smell it, and to put it in auto mode and outside circulation before turning off the car. Very disappointed in this Lexus, I have asthma, allergies and this is not acceptable.