When I go to start my car, blinking lights with a green key symbol come on and the car won't start.
This signifies that there is a malfunction with the security system. A scan tool will be needed to determine what fault codes are stored. Once the codes are retrieved this will give the mechanic a diagnostic path to follow to figure out the root cause of the problem. I would ask one of the mechanics at YourMechanic to run an inspection on your blinking lights issue.
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