Toyota is to recall its flagship Prius hybrid in Japan, it has been reported.
The reports came as the car giant told dealers in the US it was preparing to repair the brakes on thousands of Priuses there. But it was unclear whether Toyota planned a formal US recall.
The Japanese company is already in the middle of a global recall of 4.5 million other vehicles over defective accelerator pedals and floor mats that could cause unintended acceleration.
Those problems and criticism of Toyota's response to them have sullied the stellar reputation for quality long enjoyed by the world's biggest car maker.
Toyota decided on a separate recall in Japan of its latest Prius model and had notified dealers, Japan's largest newspaper, the Yomiuri, reported, without naming sources.
It said Toyota would announce the move early this week after consulting the Japanese government.
Japan's Kyodo News agency and TV Asahi carried similar reports and Kyodo said at least 170,000 vehicles in Japan would be recalled.
Toyota, which said last week it was still deciding what to do about the Prius and that a recall was an option, did not confirm the Yomiuri report.
"We will make an announcement soon on the action we plan to take," spokeswoman Ririko Takeuchi said.
The brake problem affects about 270,000 petrol-electric Priuses that were sold in the US and Japan starting last May. The company blames a software glitch and says it has already fixed vehicles that went on sale since last month.