How do you reset A5 Mercedes Benz c300 2010?

To reset the A5 service indicator on a 2010 Mercedes-Benz C300, turn on the ignition without starting the engine. Press the gas pedal three times within 10 seconds. After doing this, turn off the ignition and then restart the vehicle; the service indicator should be reset. If it doesn't reset, repeat the process to ensure it was done correctly.