An 18-year-old will appear in an Auckland court this morning after a female police officer was knocked unconscious during a violent assault in west Auckland last night.

Police said the assault occurred after a Henderson unit started pursuing a stolen car at 10.40pm.

After six minutes the car pulled to the side of the road near Ranui Railway Station and the four occupants attempted to run away.

"The male driver of the stolen vehicle then violently assaulted the female police officer attempting to arrest him, punching her in the face a number of times,'' a police statement said.

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The officer was knocked unconscious by a punch.

The four then ran from the scene through adjacent properties.

Three of them had since been located and an 18-year-old man will face charges of aggravated assault in Waitakere District Court today.

The police officer was kept in North Shore Hospital overnight as a precaution.

Anyone who has information about the incident was urged to contact Henderson Police on (09) 837 4953 or Crimestoppers anonymously on 0800 555 111.