This document explains injector removal, nozzle swap, and injector reinstallation on a VW TDI. The car used was a 2001 Golf (ALH engine). The instructions should be similar for earlier TDI engines (AHU and 1Z). I welcome email with comments or questions about the content of this howto! Anything you do to your own car is AT YOUR OWN RISK! I deny any responsibility or liability for anything that you may do to your car. I'm not a professional mechanic; I just like tinkering with my car. Don't do any of this if you aren't comfortable with modifying your engine and be prepared to deal with the consequences if you screw something up.