As the criminal investigation into General Motors' role in 13 vehicle-related deaths continues, new evidence suggests that the car company may have opted not to fix the faulty ignitions. The cost of the repair: About $1 per vehicle.

NBC has learned that a GM engineer claims the car maker knew about the problem in 2001. He spoke on camera with lawyers years ago, saying the vehicles' keys could have been fitted with inserts, thereby reducing the weight of the keys.

The faulty ignition switches have been linked to 13 deaths, but a consumer safety group now says as many as 303 may have died due to the problem. Last month, GM issued a recall to address the problem on 1.6 million vehicles.
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