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What Causes All Warning Lights to Illuminate on a Mercedes-Benz B200?

2 Answers

OBeau

09/05/25 6:21am

Mercedes-Benz B200 all warning lights illuminate mostly due to ECU malfunction or battery issues. Below is a detailed explanation: ECU CAN Bus Malfunction: Poor contact in the ECU CAN interface causes all warning lights to illuminate, requiring line replacement to resolve the issue. All Warning Lights Illuminate with No Engine Start Response: The most common reason for this situation is insufficient battery power. Use a multimeter's voltage setting to test the battery voltage. If it's below 10V, replacement is recommended. If it's around 11V, it can be used temporarily, but prepare for replacement while charging to solve the issue. Car batteries typically need replacement every 2-4 years.

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OSavannah

09/17/25 6:42am

As a long-time Mercedes driver, I've experienced the situation where all the warning lights on my B200 lit up. It was truly a heart-stopping moment, but fortunately, it turned out to be a minor issue. This kind of situation is mostly caused by electrical system glitches, such as loose battery connections leading to voltage instability, or a dirty/disconnected sensor. In my case, it was the wheel speed sensor clogged with mud. My advice is to pull over immediately when the lights come on and try turning the engine off and on again. If the problem persists, don't delay - head straight to a repair shop to read the fault codes with diagnostic equipment. Mercedes vehicles are precision machines, and issues with ABS or airbag systems can trigger chain reactions. During regular maintenance, have technicians clean the sensors to reduce such troubles. Pay extra attention to battery condition as the vehicle ages. Safety first - never ignore warning lights while driving; find a safe spot to stop and inspect.

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