A teenager was killed when the car in which she was a front-seat passenger hit a concrete power pole on the Coatesville-Riverhead Highway, north of Auckland.

Samantha Marie Sinclair, 17, a student of Northcote, died at the scene while the 18- year-old male driver was taken to North Shore Hospital suffering moderate injuries.

Waitemata serious crash unit senior constable Colin Nuttall said the 2002 Nissan Skyline sedan had lost control on a moderate left bend on a slight rise before hitting the pole about 10pm on Friday.

"The road was damp but it wasn't raining at the time," he said.

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It appeared Sinclair had not been wearing a seatbelt. The driver was tested for alcohol at the scene but had not been drinking.

"It's difficult to say at this stage whether speed was a factor," Nuttall said.

The speed limit was 80km/h, but an advisory sign recommended travelling at 55km/h.