A teenager charged over the fatal Rothesay Bay crash that took the life of Robbie Cederwall is facing additional charges.

Police have now filed additional charges in relation to the fatal crash on June 23, where 17-year-old Cederwall was seriously injured and later died in hospital.

An 18-year-old male who was initially charged with dangerous driving causing injury has also been charged over the weekend in relation to the following; driving dangerously causing death, failing to stop or ascertain injury and having an excess breath alcohol for a person under 20.

He is next scheduled to appear in the North Shore District Court on Wednesday.