How can I fix it?

It would have taken you just the effort of typing "zafira spanner flashing" into the Google search box and less tthan 30 seconds to look at the fisrst page of results to find these:

http://forums.moneysavingexpert.com/showthread.php?t=3525467

http://www.honestjohn.co.uk/forum/post/index.htm?t=59818

http://www.zafiraowners.co.uk/forum/13-newbies/630-flashing-car-spanner-icon.html

http://www.astraownersnetwork.co.uk/archive/index.php/t-50660.html

XXX
October 2015