Where is the aux jack on 2006 Mercedes e350?

The 2006 Mercedes-Benz E350 does not have an aux jack instead, it has a media interface port located in the center console and a CD player. To connect an external audio device, you can use the media interface port if you have the Media Interface option installed in your car. If you don't have the Media Interface option, you can use a cassette adapter or an FM transmitter.