Honda expects to recall vehicles that could have defective air bags, a move that could increase an already massive multi-company air-bag recall by over a million, according to Reuters.

The recall involves faulty air-bag inflators supplied by Takata Corp and would follow a similar move made by Toyota Motors last week. 

The Honda recall will be announced before the end of June, according to Reuters, citing a person with knowledge, who declined to be identified.

Honda is also conducting an investigation of its own to figure out how many vehicles it may need to call back and where they are, while waiting for further information from Takata on its inflator issues.

The number of vehicles it recalls could reach 1.135 million vehicles Honda recalled globally in 2013.

"We are conducting investigations quickly and if we decide that there are vehicles that should be called back, we will swiftly file for a recall," said Honda spokeswoman Akemi Ando, according to Reuters.

The largest automaker in the world recalled 1.62 million previously called back vehicles outside Japan, as well as 650,000 more in Japan no recalled previously.

The additional models brought to over 7 million the total number of vehicles equipped with Takata air bags to be called back globally over the last five years, according to Reuters.

Toyota's recall from 2013 was a part of a bigger recall by car makers that include Nissan, Mazda, and Honda.

Toyota has determined that serial numbers of potentially faulty inflators that Takata supplied in the past were incomplete.

Takata publicly stated that it supports Toyota's decision to recall the vehicles, according to Reuters.

The National Highway Traffic Safety Administration said recently it had opened an investigation this week into an estimated 1,092,000 vehicles made by Toyota, Honda, Nissan, Mazda and Fiat SpA's Chrysler Group.

An investigation was opened after the NHTSA received six reports of air bags not deploying properly in the humid climates Puerto Rico and Florida. 

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