Cars do have accurate weight sensors actually. I’m a former Honda Master Technician. The drivers seat on Honda’s from probably mid 2000 onward have a weight sensor. It’s used to determine the deployment for the multi stage airbags. I hooked up our diagnostic equipment and sat in the seat once to see how accurate it was. And it’s very accurate. However most people sit with their feet on the floor, so it doesn’t show the proper weight. But lift your feet up, and it was accurate to within a pound of my actual weight.

However, this is FUD, because Honda didn’t do squat with that data beyond the airbag system. It wasn’t collected or transmitted. It was simply used at the moment of airbag deployment to determine if it should deploy the airbag in fast or slow mode.

So you’re right to call the articles claim BS, but you’re wrong if you think there isn’t an accurate weight sensor in the car.

I can’t remember if the passenger seat had one too. I don’t think it did. The dual-stage airbags are really only relevant for the driver side because of the steering wheel.