How to Reset the Service Light on a Mercedes CLK

The process to reset the service or maintenance warning on a Mercedes CLK may vary slightly depending on the production year and version of the vehicle. Note: Ensure you perform this procedure only after completing the scheduled maintenance on your vehicle and confirming that the service warning has been adequately addressed. Here is a possible procedure to reset the service warning on a Mercedes CLK: 1. Ensure the instrument cluster displays "Total Kilometres" or "Total Distance Travelled". 2. Turn off the engine and remove the key from the ignition. 3. Press and hold the "O" button or the "OK" button located on the steering wheel. While holding it down, reinsert the key into the ignition (without starting the engine). 4. Keep the "O" or "OK" button pressed for about 10-15 seconds until the service reset message appears. A message like "Reset oil service" or "Reset confirmed" may show. 5. Release the "O" or "OK" button and then press it again to confirm the reset. 6. At this point, you should receive a confirmation message on the instrument cluster indicating that the service warning has been reset successfully. 7. Turn off the engine, remove the key, and wait a few seconds before restarting the vehicle. If this procedure does not work or you have difficulty completing it, I recommend contacting a Mercedes dealer or a qualified technician for professional and safe assistance.