Try volkswagon TDI site. Warranty on 2012 diesels till end of 2023 or until 120K miles usually. Good honest heavy warranty. Longer of course if it is newer than a 2012.

Depending on the code meaning on these the dealer service is really needed. As can be pretty complex repair often. Expensive not under warranty. Dealer can pull your vin number. To check for warranty.

As long as you are below 120K miles. We own one and can be a pretty deep pocket repairs proposition after. May be illegal but disabling systems gets around the common problems that will develop usually. Problem though is after doing it the car cannot get dealer service without them checking and getting rid of the reprogramming. Reprograming to beat emissions as well kills the warranty. The code number of course could be a very small problem.