Does Mercedes C-Class lock automatically?

Yes, Mercedes C-Class is equipped with automatic door-locking function, which is enabled by default. However, you can also enter the vehicle settings menu for personalized customization. Usually, when the vehicle speed exceeds 15 kilometers per hour, the door locks will be automatically activated to ensure driving safety. Additionally, after unlocking the doors with the remote key, if the vehicle isn't operated (including the doors and the trunk) within 1 minute, the system will automatically lock the doors once. But when you park and get out of the car in daily use, if you don't manually lock the doors, the vehicle won't automatically lock. Instead, there's a reminder function, which will sound an alarm when the doors aren't locked, and you can use the remote control at this time. Moreover, if you unlock the doors with the remote control after locking the car but don't open them, the doors will be locked again within 1 minute. If you forget to lock the doors when getting out, there's no such automatic operation. This design helps prevent the keys from being left inside the vehicle.