RNZ reports Ranger appeared at the Waitakere District Court yesterday and pleaded guilty to charges of careless driving and drink driving.
He was convicted, and disqualified from driving for seven months, fined $800 and ordered to pay court costs.
Blues Rugby Chief Executive Michael Redman said that it was disappointing Ranger had found himself in this position.
"We are disappointed in the poor choice that Rene made, especially for a player of his experience.