What to Do When Mercedes-Benz Fails to Detect the Key and Cannot Start?
2 Answers
Mercedes-Benz fails to detect the key and cannot start. The solutions are: 1. Dead key battery: Replace the battery in the key; 2. On-board computer program issue: Some signal recognition and conversion in the vehicle are executed through software programs. You can go to a 4S shop to upgrade the program. Taking the Mercedes-Benz S-Class 2021 S400L Business Edition as an example: It is a large car launched by Mercedes-Benz (imported), with a length, width, and height of 5290mm, 1921mm, and 1503mm respectively, and a wheelbase of 3216mm. It is equipped with a 3.0T turbocharged engine, with a maximum power of 230kw and a maximum torque of 450nm, matched with a 9-speed automatic manual transmission.
Last time my Mercedes also had this issue, it was so frustrating. Later I found that a dead key fob battery is the most common cause - just replace the coin cell battery yourself, the model number is on the back of the key. Sometimes interference is the culprit too - if there are high-voltage lines or electronic devices nearby, try moving the car to another spot. The emergency start position is on the right side of the steering wheel - pressing the key against it might work. Try the spare key first; if that doesn't help, check if the car battery voltage is normal. As a last resort, you'll have to call for assistance. The dealership said repairing a faulty key recognition module can cost over a thousand bucks. Usually, avoiding placing the key near your phone can reduce malfunctions.
