Hi my 09 xc60 is showing a message that says "Book time for maintance" how do i switch this off and does it mean service due 112k on clock cambelt kit replaced.

 

Try this (may not work for all years):
Turn the ignition switch to position I (ACC)
Press and hold the OK button on the turn signal arm.
Continue to hold OK button and turn the ignition switch to position II (RUN)
Wait about 10 seconds and release the button once the information light begins to flash.