Mercedes-Benz AMG GT 53 4MATIC+ 2019 Operator's Manual page 69

Problem
You have lost a SmartKey.
Possible causes/consequences and
The SmartKey is defective.
R
Check the battery using the battery check lamp and replace if necessary (
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Use the emergency key to lock or unlock (
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Have the SmartKey checked at a qualified specialist workshop.
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Have the SmartKey deactivated at a qualified specialist workshop.
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If necessary, have the mechanical lock changed as well.
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M M Solutions
page 65).
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67
Opening and closing
page 65).
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