A 17-year-old boy received head injuries after a collision involving a grey Seat Arosa, which did not stop at the scene.
It occurred at 4.25pm on Wednesday 4 December 2013, near the Empress roundabout on Skipton Road.
The driver of the Seat contacted the police a short time after the incident.
As a result of the collision the pedestrian suffered a serious head injury and was taken to Harrogate Hospital, where he remains under observation.
Traffic Sergeant Hamish Halloway, of the Force’s Roads Policing Group, said:
If you witnessed the collision and have not yet contacted the police, I urge you to do so straight away.
I am also keen to speak to anyone who saw the boy or car just prior to the incident and ask them to get in touch.
Anyone who can assist officers with this enquiry is asked to contact North Yorkshire Police on 101, select option 2 and ask for Dave Lever. Alternatively, information can be emailed to firstname.lastname@example.org.
Please quote reference number 12130209941.