Mercedes Benz Air quality sensor lets open it up.on Most Mercedes Benz from 2000-2007 

I believe they call this the air Quality sensor
The fault code in the climate control unit will show (1464 )
But I think it does more then Detect pollutants smog humidity and temperature..
The part number is the same but look out for the middle you could have q01, q02,q03,q04
Not exactly sure what that means but
Call Mercedes Benz before ordering this part from online.
This part is about $400 so ill de an update in the future once I replace it to see anything different changes because of the new one
Please support the channel if you find anything helpful here!!!