How do you turn off the Dealer service light on a 2007 S60 Volvo?

Take it to a dealer. (Helpful score -10)

A somewhat less trite answer is:

1..... Turn ignition to position 1

2..... Press the trip reset down and hold

3..... Turn ignition to position 2 (within 2 seconds of holding down the trip reset)

Continue to hold the reset in until the original milage is returned, then release.

Switch ignition off, count to ten then turn on again, warning should be removed.

Now make sure your vehicle is serviced, changing the oil is the cheapest spare part !!

Most 2003 onwards vehicles have a yellow warning triangle in the centre of the dash, this will light up when it is time to release the button.

Hope this helps........