Toyota has said it will repair 650,000 Prius models worldwide because of a fault with the coolant pump.
The problem, which does not represent a safety risk, could cause the vehicle to overheat and lose power.
The Prius models involved were sold between 2004 and 2007 with more than half in North America, 180,000 in Japan and another 70,000 in Europe.
Toyota is the biggest carmaker in the world, and the Prius is the best-selling hybrid model in Japan.
The company said it had not received any reports of accidents or injuries from problems with the pump, which circulates coolant for the hybrid system. BBC News
