High/Medium/Low represents the probability of this cause occurring
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It is hard to determine based on visual check whether the root cause of brake lamp not functioning is due to wiring issue or the bulb faulty, suggest to diagnose at workshop. The usual keypoints of diagnose are:
1. Check if the brake light bulb is broken.
2. Check if the wiring is aged, replace the wiring harness if the aged condition is severe.
3. Check the brake operating signal is it transmitting normally.
4. Use the scan tool to clear the fault code after repairing done.