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Key will occasionally not start car unless key is reinserted --sometimes several times--could the immobilizer relay failing?
 

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If it's the immobilizer, there should be a green key symbol lighting up on the dash. It could also be a garden-variety loose connection somewhere (which wouldn't show the key symbol unless the loose connection is in the immobilizer).
 

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Could be the switch itself. I once had a recall for the ignition switch done at the dealer and they didn’t align the lock properly so it would not turn sometimes. Needless to say I immediately took it back the first time it happened. But that is mechanical not electrical in nature. Immobilized shouldn’t prevent you from turning the key. If you have the expertise, try taking the lock out, clean and reinstall.
 
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