It is not so easy. I have loosen the screw of hose pipe 13&12 and remove a sensor plug attached on it. It appears to me that I have to unclip the clips, loosen the screw on part13&12 and remove a sensor plug on back cover housing..
There is no screw removal required.There is no sensor plug or hose pipe removal required.It appears that You are doing it all wrong. I have owned ritz for 8 years and have opened it at least 30 times if not more. You just have to unclip the 4 clips, that's all is what is required.And it takes 4 min max from bonnet opening to taking the filter out!