How do you re sync y reg vauxhall corsa fob?

To re-sync the key fob for a Vauxhall Corsa Y-reg, sit in the car with all doors closed. Insert the key into the ignition and turn it to the "On" position without starting the engine, then press and hold the "Lock" button on the fob for about 10 seconds. Turn the ignition off, remove the key, and then test the fob to see if it works. If it doesn't, you may need to repeat the process or consult a professional.