Found some usefull info. about how to get rid of 'spanner' sign on dashboard.
Manual says , dashboard should show number of kilometers/months till next inspection is due.*
So , if you your inspection time (as per dashboard) is due , then this spanner mark will appear there untill you get rid of it using below steps
1-switch ignition ON (lights)
2-press button on end of stalk(RH)until spanner symbol flashes & distance remaining to next service appears in the odometer display.
3-press & hold the little stalk on dash display(trip reset) for 10 secs until new service interval is displayed.let go of stalk.
4 turn ignition off.
1,switch ignition OFF,
2,press & hold trip reset stalk(instrument cluster)
3,Switch ignition ON
4,keep pressed for 10 secs,
Display will now read 0 and 'spanner' symbol will go out*
source ( http://www.tenerifeforum.org/tenerife-forum/archive/index.php/t-1999.html?)