Where is the light relay on a Polo Tdi 1.9 2005?

The light relay on a 2005 Polo TDI 1.9 is typically located in the fuse box, which can be found under the dashboard on the driver's side. You may need to remove a cover to access the fuse box. The specific relay for the headlights is usually labeled, so consult the fuse box diagram on the inside of the cover or in the owner's manual for exact identification.