When I put the key in the ignition, I have to turn the key back and forth several times before the car will start.
Try another key to see if the problem is with the key; otherwise your ignition lock cylinder or ignition switch is bad. The ignition switch is the most likely cause of the failure you are having. I recommend having a mechanic, such as one from YourMechanic, inspect your starting difficulty issue to identify and quote the repairs needed.
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