BMW E87 lights going out or bulb failure warning
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Why is my E87 tail light not working and the car reports a blown bulb?
The cause can be a bulb with too low a wattage. The light module interprets it as a short circuit and cuts the power to the light. Use the correct bulb and reset the fault with a diagnostic program from the module's short circuit counter.
Why did both xenon headlights of my E87 go out at start-up?
The cause can be moisture inside the headlight if the lens has cracks. Moisture can destroy the lamp control units. In that case new control units are needed, which are coded to the car. Also check the fault codes with a diagnostic tool.
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