About Recognising common defects: from steering to tyre: which statement is WRONG?
'You cannot rely on a defective bulb being indicated by a dashboard warning.' Daily checking before departure remains necessary.
'If your brakes feel 'spongy' there is probably something wrong with your brake cylinder. Have your car checked as soon as possible.' This is not ordinary wear but a defect requiring immediate action.
A green valve cap on the tyres is a legal requirement.
Unevenly worn tyres and a vibrating steering wheel point to bent or shifted suspension components (tracking), for example after hitting a kerb hard — not primarily to pressure.
Explanation
Book p.225 - the green valve cap is simply how you recognise nitrogen filling; nitrogen is a choice with benefits (holds pressure longer, lower consumption, shorter braking distance), not a legal requirement.