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If you're wondering why the third brake light isn't functioning on your BMW X5, I can provide some insights. One common reason for this issue is a burnt-out bulb. Simply replacing the bulb can often resolve the problem. However, if that doesn't work, a faulty brake light switch could be the culprit. It's essential to promptly replace a malfunctioning brake light switch for safety reasons while driving. Additionally, a faulty fuse can also cause the third brake light to stop working, as fuses supply power to various components. When a fuse blows, the affected components cease to function.
Make sure to inspect the bulbs and fuse if the third brake light on your BMW X5 is not functioning properly.