An off-duty NYPD sergeant was busted for drunk driving after he struck a parked private patrol car in the Bronx early Tuesday, cops said. 

Frederick Lewis, 40, was in his personal car when he accidentally slammed into a Co-Op City Police Department car just before 1:30 a.m., authorities said. 

The vehicle was unoccupied and no one was hurt, cops said. 

The sergeant, who remained on scene, appeared to be intoxicated, police said. 

He was busted in the confines of the 45th Precinct and charged with operating a motor vehicle while under the influence of alcohol, cops said.