Toyota says it will use a software update to fix an issue with some Prius models, saying certain conditions could result in their unexpectedly stalling. Here, a Prius is seen during a test drive in Tokyo in 2011.

Toyota says it will use a software update to fix an issue with some Prius models, saying certain conditions could result in their unexpectedly stalling. Here, a Prius is seen during a test drive in Tokyo in 2011.