the security light flashes?

2004 SATURN ION
64,000 MILES • 4 CYL • 2WD • AUTOMATIC
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I think that a sensor is out the security light flashes and I can't start the car for a while, then it starts, but now it won't start and my mechanic told me that its the security which makes sense. How can I fix the probably without spending a bundle?
Oct 19, 2010 at 9:47 PM
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We would suspect the key or key reader, (if chip key is used) A diagnostic code read should give you information of any ECU sensor faults.
Oct 19, 2010 at 9:50 PM