Just days ago, Honda announced it would expand its global Takata airbag inflator recall by 4.89 million vehicles globally, though none of those were in the US. Now, the automaker has broadened the safety campaign in Japan by 340,000 units.

The company's Japanese expansion includes 80,000 vehicles to replace their driver's side inflators. According to Reuters, these cars were covered under an earlier recall but weren't yet repaired. There are also 260,000 additional automobiles in the country in need of passenger side replacements.

A broadened campaign is also coming for the US, but its extent isn't known yet. According to Reuters, Honda submitted the necessary documents to regulators on May 27. However, the automaker has decided to wait for National Highway Traffic Safety Administration to make the official announcement.

Takata's exploding inflators are linked to six deaths and many injuries. Research indicates that exposure to moisture causes the part's propellant to ignite too quickly when the airbag is activated and can cause these ruptures. In testing on components taken from recalled vehicles, Takata found hundreds of cases of them bursting.

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