It occurred at 5.45pm on Thursday 30 August 2012, on Newby Crescent, involving a 6-year-old local boy and a silver Rover 75, driven by a 68-year-old man from Chepstow.
As a result of the collision the boy was taken to Leeds General Infirmary, with a serious head injury, where he remains in a critical but stable condition.
The driver of the Rover was not injured.
Traffic Constable Steve Gardner, of North Yorkshire Police’s Roads Policing Group, said:
If you witnessed the collision or saw either the young boy or the car prior to the incident, please contact the police straight away.
Anyone who can help the police with this investigation is asked to contact North Yorkshire Police on 101, press option 2 and ask for Steve Gardner. Alternatively information can be emailed to firstname.lastname@example.org