Phone call.
The guy who introduced Becky to her new job tells the story to the other staff. He is a mate of Michael's and was at the wedding, he is also a sort of boss. So one of the lads takes pity on Becky and offers his assistance.
More oil is given to the engine and the brake fluid is topped up. Driving home Becky still gets the beeping, but no genie lamp! What is going on?
The back seat sensor thinks that her extremely heavy bag is a person and that the seat belt is not on! On the way down to the wedding we had my suit, her Bridesmaid outfit, my man-bag and her overnight bag all on the seat. Problem Pt2 solved.
Women and cars!