I've observed this problem in every second Santro. (the air filter cover opens when u accelerate hard on cng)
My bro has started facing the same problem. technically WHAT ACTUALLY IS THE PROBLEM? can anybody explain. Is it the loose locks of cover? i dont think so. wats the permanent solution of it. Some ppl suggest that just change the filter box. Its terrible if u have to change the box every year.
This problem is getting on our nerves. Kindly help