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To program a Mercedes-Benz W203 key, you'll typically need to use a specialized diagnostic tool or a key programming device, as the process often requires access to the vehicle's electronic systems. Start by inserting the new key into the ignition and turning it to the "On" position without starting the engine. Using the diagnostic tool, follow the prompts to sync the key with the vehicle’s ECU, which usually involves entering the vehicle's VIN and following the on-screen instructions. If you don't have the necessary tools, it's advisable to visit a certified Mercedes-Benz dealership or a qualified locksmith.

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1mo ago

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