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I just had a Key programmed and I was wondering how long should it be before the key pairs with the car 2002 s500

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MercedesMedic  1 year 1 month ago

Technically the key will work as soon as you plug it into the igntion. With that said, I did have a W220 that took several hours for the key to work.

Connect a charger and let the key in the igntion overnight.

Do you get any specfic error messages on the dashboard.