Does the 2003 Acura MDX have aux input?

The 2003 Acura MDX does not have an aux input or a USB port. That said You can find aftermarket parts that will allow You to install one. They are normally about 100 to 150 dollars on average and replace or bolt into the slot where the old radio would go. If You have a shop put it in then it will cost another hundred, but the kits come with instructions so it should be simple enough to do at home. You can also get cassette tapes witH3.5 Audio jacks on the end of them which will allow You to play music from Your phone through the cassete. This will only cost You about 20 dollars, so it may be a better option to save money.