UPDATE 2-Toyota expands Takata air bag recall in Japan, China
* Japan regulators say may revise recall system
* Authorities checking whether other automakers affected
* Toyota say cause of problem still unknown (Adds information on Japanese regulators)
By Mari Saito and Chang-Ran Kim
TOKYO, Dec 4 (Reuters) - Toyota Motor Corp said on Thursday it would call back 190,000 more vehicles to replace potentially defective air bags made by Takata Corp, and Japan's regulator said it may change its recall system to better respond to what it called an "unprecedented" crisis.
The transport ministry, which also acts as the auto industry regulator, told reporters it was considering revising parts of the existing recall system, but gave no details.
"Changing the law would be a lot more involved, but there are things we can change outside the law," said Masato Sahashi, head of the ministry's recall division. "What we're considering is not something that would take as long as a month or two."
In the United States, the auto safety regulator, the National Highway Traffic Safety Administration (NHTSA), has come under fire for not moving quickly enough to ensure wider recalls of cars fitted with possibly defective air bags.
Toyota's recall follows an explosion of a Takata-made air bag inflator in a 2003-model Toyota subcompact at a scrapyard in Japan last month, though the cause of the potential problem is still unknown, the ministry said. Continuación...