Road policing staff and two VTNZ vehicle inspectors stopped 36 vehicles and inspected 18 overnight on Saturday, Acting Senior Sergeant Blair Shirley said.
Nine pink stickers and two green stickers were issued, ordering 11 of the vehicles off the road.
Of the remaining seven, six had minor issues and only one had no faults, he said.
Police issued 38 infringement notices as well, he said.
Notable issues were modified and uncertified suspensions and wheels, expired Warrants of Fitness and/or registrations, and a few vehicles with rust and badly-worn tyres.
Acting Snr Sgt Shirley said it was a "great effort" by road policing staff.
“We are glad to see these vehicles ordered off our roads, these vehicles are a risk to not only those who choose to drive them, but to other road users and members of the public.
“We will continue our work to identify and stop these drivers and ask Southlanders who witness this behaviour or have information that could assist in identifying these vehicles to please contact police.”