How can you open a zafira bonnet as the catch is not working?

If the bonnet catch on your Zafira is not working, you can try pulling the release lever multiple times to see if it loosens. If that doesn't work, use a flathead screwdriver or a similar tool to carefully pry open the latch from the front grille while someone else pulls the release lever. Alternatively, you may need to access the latch mechanism from underneath the vehicle or through the wheel arch to manually release it. If these methods fail, consulting a mechanic is advisable for a proper fix.