When I turn the key, sometimes nothing happens. If I force the key, it turns over.
My car has 160000 miles.
My car has an automatic transmission.
This can happen when the key itself gets worn out making the switch inside inoperable to that particular key. This can also happen when the inside cylinder parts begin to wear out or become inoperable for the same reason. As you insert the key and turn it, there are contacts inside that are activated when the key is turned. When the key cylinder becomes worn out, these contacts can also begin to wear out making them sometimes very tough to engage.
If you don't want to go the dealer route, I would recommend having a professional from YourMechanic come to your location to diagnose your starting issue and service your ignition switch if necessary.
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