He blew 593mcg.
The legal limit for a driver aged under 20 in New Zealand is zero.
Meanwhile, the vehicle that had fled was pursued by a Police dog vehicle and was found crashed in a culvert and rolled on to its right hand on School Rd South.
The 16-year-old driver of the vehicle had removed himself and continued to flee on foot, leaving behind a 18-year-old male trapped in the vehicle.
Hato Hone St John and Fire and Emergency NZ were called to the scene, and the 18-year-old was extricated from the vehicle and transported to hospital.
The 16-year-old was found to have a breath alcohol level of 491mcg.
The occupants of the other car were not arrested and will be referred to Youth Aid.
The occupant who blew 671mcg had his licence suspended for 28 days, and the vehicle was impounded for six months for failing to stop.
Ben Tomsett is a Multimedia Journalist for the New Zealand Herald, based in Dunedin