Jeff, Nigel. Having the same issue, would be grateful for advice (can't seem to find p306 referred to in above answer).

Also have a nightmare with alarm going off randomly (4.30am this morning, neighbours must love me) This is despite the car being deliberately unlocked!! Any ideas on how to just prevent the alarm arming?

Guy Brandon, September 2007

car get gas to injectors but dont release it to the engine is it the regulator that causes that

robert, November 2010

hi thanks for that volvo v40 02 plate , held in switch turned on ignition held for 10 secs. service light went off.
brilliant

jim, March 2010

Hi,
The sequence for reseting the upto 1999 model is not quite right.
Before switching on ignition, press & hold trip reset button.
Switch on ignition, wait 10 secs, service indicator flashes, release trip reset button, audible confirmation will be heard.
Job done.

Don, January 2010

that totally worked-I've had two service dudes say they reset it when in fact they did not-thanks!

andrea, November 2009

Hi there just tried both ways to reset tthe service light but it didnt work. Does having the on board computer make any difference.

Kevin harris, July 2009

the 2000 on on worked a treat on mine thanks

ash, May 2008

Hi Guy there are two methods to reset the service light depends on year
up to 1999
switch ignition on press and hold in the trip reset button for 12 seconds service light will flash release trip reset button within 4 seconds and an audible signal will sound
2000+
ignition off hold in trip reset button switch ignition on still holding button keep button depressed for 10 seconds service light will flash release button within 4 seconds an audible signal will sound

nigel, September 2007