The National Highway Traffic Safety Administration says it is investigating steering problems in about 500,000 Ford cars.
The investigation covers 2004 to 2007 Crown Victoria, Grand Marquis and Marauder models.
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NHTSA says a heat shield in the car can rust, dislodge and cause the steering shaft to jam. It has received 5 complaints about the issue and knows of one injury. In that case, the steering froze as a driver entered a high entrance ramp, causing the car to roll over and cause injuries.
Ford Motor Co. says it will cooperate with the NHTSA on the investigation.