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To reset the immobilizer on a Vauxhall Astra, first ensure that you have the correct key and that the battery is functional. Insert the key into the ignition and turn it to the "On" position without starting the engine. Leave it in this position for about 10 minutes until the security light on the dashboard turns off, then turn the ignition off and try starting the engine. If issues persist, consult the vehicle's manual or seek assistance from a professional.

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