vw polo 04 "how turn off service light"?

This is it for a Golf, maybe it is similar for your Polo:

How to Reset Service Indicator on VW 2.0 TDI

Reset it yourself onto the variable service indicator,

Do the following below

Service due reminder

It's all about the trip-reset, button, with the ignition on, let the seatbelt alarm go off (if you're not wearing it) preferably wear the seatbelt and within 2 seconds of turning the key to light up the ignition lights, (do not start engine) press and hold the trip-reset button. You will NOT lose the trip count - it'll go to zero initially, show you the mileage to the next service interval, and the trip counter will go back to what it was.

The display resets back to the normal computer after about 30 secs.

ChicksFan
May 2011