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Get him to do a complete system auto scan, and check all system for malfunction codes .
Have you added any HID or LED lights,
All it takes is for the incorrect light bulb to be fitted ,bad connection that builds to much resistance etc.
check number plate bulb this will also set it off.
And have the multifunktional control box checked .
We have seen in some cases when having a hard time in diagnosing this issue with out any diagnostic malfunction codes
was to replace all bulbs with dealer supplied and cleaned all sockets has cleared this issue.