There's your answer then, Griffer!
It is the simple answer, but the sensitivity of the kg system can be adjusted using DAS, as this car does seem to be ultra sensitive I would suggest an inspection with DAS.
"I am enclosing two tickets to the first night of my new play; bring a friend, if you have one
- George Bernard Shaw to Winston Churchill.
"Cannot possibly attend first night, will attend second ... if there is one
- Winston Churchill, in response.