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Just to add, I have a keyless car and the steering lock is engaged when the car has been switched off, in park and the door has been opened.

But I wonder what would happen if I was travelling and I just pressed the start/stop button, if the car would actually switch off.

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If you have a safe area it's worth testing how your car works, usually push-to-start is actually a multi-state button between Ignition & Accessory On, Ignition Off & Accessory On, and All Off.

Absolutely, I know that if I press the start button without pressing the brake it will initiate Accessory On but not the ignition.

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