If you've had difficulty identifying what is causing a persistent glow-plug fault in your TDI, use this kit to replace the glow plugs and harness. It includes a glow plug harness from VW and a set of four glow plugs - your choice of Febi, Bosch or Beru.
This kit fits A4 ALH cars with the later, 4-wire glow plug harness. If you're not sure which harness you have on your A4, look at the existing harness. If it has four wires coming out of the shielded portion connecting to the glow plugs, this kit will fit your car.