Opel Astra G 1.6 16v - How to replace the battery in the key? CR2032

The battery in the key is not used to communicate with the immobilizer, but the remote control of the central lock, but it's worth replacing it once a year, low cost, and the car will open and close from a distance.
Replace the batteries in less than 30 seconds, the faster the better so that you do not have to program the key.
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