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How to Reprogram the Key of a Smart 451

Model: Smart Smart 451 - Years 2007-2015
Part: Key

If the key still doesn't work after replacing the remote battery, you need to reprogram it. To reprogram the key for a Smart model 451, do the following: - Insert the key into the ignition; - Turn on the ignition; - Press the unlock button for a few seconds; - Press the lock button for a few seconds; Now try to start the vehicle. If the issue is resolved, remove the key. If the problem persists, it may be due to the control unit, and you should visit a garage.

Updated on 18 September 2026 by ScegliAuto

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