How Many Times to Press the One-Button Start?

[RowanMarie]

Mercedes-Benz one-button start requires pressing twice. The first press of the start button powers up the car, allowing it to perform a self-check. If no abnormalities are detected during the self-check, the second press can be made to start the engine. Below are the precautions for using the one-button start: Turning off the engine while driving: In case of an emergency while the vehicle is in motion, the engine can be turned off by pressing the engine start/stop button for more than 3 seconds or pressing it three times consecutively. The power will then switch to the ACC state. Starting the engine while driving: If the engine stalls while the vehicle is in motion, it can be restarted without pressing the brake pedal by shifting the gear lever to the N (neutral) position and pressing the engine start/stop button.

[Nguyen]

I remember years ago when driving a manual transmission car, you had to turn the key to start it. Now that I've switched to a car with push-button start, it's indeed much more convenient. Generally speaking, you press the brake pedal and then press the start button once, and the engine roars to life. The prerequisite is that the key must be inside the car, such as in your pocket or bag, as the system detects it via sensors. If you don't press the brake pedal, pressing the button once might only light up the dashboard and enter ACC mode; pressing it again switches to ON mode, but the engine won't start. This design is quite safe, preventing accidental operations. I've driven this kind of car for several years and never made a mistake, though occasionally friends getting in the car forget to press the brake and press the button a few times without starting the engine. Just remember to press the brake and press the button once—no need to press repeatedly, as the system responds quickly.

[OZane]

My car comes with a one-button start. Every time I drive, I habitually press the brake and lightly tap the button—it's super simple. No more fumbling around to find the keyhole and turn it like in the old days. It's best to keep the key on you, otherwise pressing the button won't work. The system is quite smart—it only allows startup after detecting the key signal. Sometimes, if I press the button without stepping on the brake, the screen lights up but the car doesn’t start; in that case, playing music or charging is no problem. The advantage is the speed—it’s also convenient for quick restarts after briefly turning off the engine at traffic lights. Friends often ask me about this, and I tell them just press the brake and tap the button once—that’s all it takes.

[Daryl]

In vehicles with a one-button start, the standard operation is to press the start button once while holding down the brake pedal, and the engine will start immediately. The design intention is to simplify the process, relying on wireless key detection to achieve secure ignition. If the brake is not engaged, the first press enters the accessory power supply mode, and the second press switches to the ignition preparation state. I have studied different models and found that some require confirmation of the key near the driver's seat; after starting, a constant flashing indicator light indicates readiness. Avoid frequent button pressing, as it may interfere with the system logic.