It might not. My previous car, a C5, didn't and I was told that it was because it was designed to the French system of postcodes (5 characters). My present car, a DS4 does accept the full post code, but I believe that it is because it is a 2014 car. Others are not so lucky. I enter the full post code by simply entering it in the 'Town' part of the address when you select the address screen. On mine, the Sat Nav allows you to enter numbers after the first two letters of the Town line have been entered on the screen. If you do this it keeps the numbers option on the screen until the third number of the postcode has been entered and then reverts to letters so you can enter the last two letters of the seven character post code. Give it a go. Good luck.