1. OBD Port Connection: Connect a compatible diagnostic tool to the vehicle's OBD (on-board diagnostics) port, typically located under the dashboard.
2. Vehicle Identification: Select the vehicle's make, model, and year within the diagnostic tool's interface.
3. Key Fob Detection: Place the existing key fob near the vehicle's ignition or a designated programming area. The diagnostic tool should detect and establish communication with the key fob.
4. Erase Old Key: The diagnostic tool may prompt you to erase the old key fob from the vehicle's memory. This removes the previous programming associated with that specific fob.
5. New Key Programming: Place the new key fob in the designated location (usually near the ignition). The diagnostic tool guides you through the steps to program the new fob to the vehicle's electronic control unit (ECU).
6. Initialization and Synchronization: The tool may perform an initialization process to synchronize the new key with the vehicle's immobilizer and other security features.
7. Testing the Key Fob: Once programmed, try locking and unlocking the vehicle using the new key fob to ensure it functions properly.
8. Key Fob Verification: The diagnostic tool may provide a confirmation message indicating that the key fob has been successfully programmed.
9. Repeat for Additional Fobs: If you have additional key fobs, you may need to repeat the process for each one to program them all to the vehicle.
10. Secure Fobs: Store the programmed key fobs in a safe place and handle them with care to avoid damage or accidental deprogramming.
Recoding key fobs can vary based on the specific model and year of the Mercedes C 250. Additionally, some advanced electronic features may require specialized tools or manufacturer-specific software to recode. If you are unsure about the procedure or do not possess the necessary equipment, it's advisable to consult with a reputable automotive locksmith, mechanic, or dealership to have the key fobs recoded professionally.
