G.M. Recalls Some Cars, but Not All, With Ignition Switch Problem

General Motors in 2006 sent dealers a technical service bulletin warning that because of an ignition problem, a heavy key chain hanging from the ignition could turn off the engine on six models. But only two of those models were covered in last week’s recall of 778,000 vehicles in the United States and Canada for the problem that the automaker now says could keep air bags from deploying in a crash.

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