Why Do Mercedes-Benz Sensors Fail?
2 Answers
Mercedes-Benz sensors may fail due to poor fuel quality, abnormal working voltage of spark plugs and ignition coils, and poor working condition of the three-way catalytic converter. Explanation of Reasons: Pay attention to fuel quality and try to avoid refueling at small gas stations. Check whether the working voltage of spark plugs and ignition coils is normal. Inspect the three-way catalytic converter to ensure it is functioning well and free from blockages. Once a sensor fails, the computer of the electronic fuel injection system will not receive information about the oxygen concentration in the exhaust pipe. If feedback control of the air-fuel ratio is compromised, it will lead to increased engine fuel consumption and exhaust pollution, as well as symptoms such as unstable idling, misfires, and surging. Damaged sensors should be replaced or repaired as soon as possible. Introduction to Sensors: Automotive sensors are input devices for the car's computer system. They convert various operational conditions of the vehicle, such as speed, temperature of various media, and engine operating conditions, into electrical signals for the computer, ensuring the engine operates in the optimal state. Sensors play an extremely important role in automobiles. If a sensor malfunctions, the corresponding device may not work properly or even cease to function. Among the many sensors, the speed sensor is relatively prone to failure. Symptoms include: unstable engine idling; momentary stalling or engine shutdown when starting or decelerating to a stop; reduced engine acceleration performance; discrepancies in the speed displayed on the dashboard; and the engine warning light turning on.
I've been driving a Mercedes for many years and have seen that the main causes of sensor failures are physical aging and environmental damage. Sensors in the car are exposed to high temperatures, vibrations, and dust, which over time can lead to loose connections or wear and tear of internal components. For example, oxygen sensors work near the exhaust system and are prone to material fatigue due to thermal cycling. Chassis sensors are easily damaged by stone impacts or corrosion from water accumulation. I recommend regularly checking the cleanliness of the engine compartment, especially wiping the sensor areas after snow removal in winter to reduce rust. Parking in the shade during summer heat can prevent overheating. Additionally, it's best to use original factory parts when replacing sensors to avoid compatibility issues. These small habits can significantly extend sensor life, saving both money and hassle.
