L322 Trip Computer

How do i zero the trip computer..for average speed..fuel consumption ect..iv tried holding the button in but the word " PROG " appears and nothin much else happens.

if you've got sat nav its reset on the settings screen (top left menu I think) if not then i think its still done via the radio control module.

Mine is faulty at the mo, something to do with the clock so I'm missing certain functions but my old one was definately cleared via the sat nav

No sat nav mate, il have to try and get hold of a owners handbook i think.