What is the latest exact problem with cars of Toyota?

Japanese car giant Toyota has warned about potential faults with the engines of about 270, 000 cars it has sold worldwide, including the luxury Lexus. (8) It said the engines could stall while being driven, but affected vehicles have not yet been recalled. This is the latest problem to hit the carmaker, which has recalled more than 10 million vehicles globally since last September. Fresh figures show Toyota’s June sales in Japan were up 26.7% on a year ago. A spokeswoman for the firm said some vehicles might have a problem with the valve spring in their engines, which could cause engine failure. But no accidents had been reported, the spokeswoman said. Toyota shares were down by more than 2% on Thursday.