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Searched for this issue as I am also experiencing an intermittent fault of the right rear turn signal. It first happened after disconnecting the battery months ago for a Dinan elite tune install. It happened until I turned the car off and back on and went away for weeks. Over the months its becoming more and more frequent, but it would always sort itself out and work again. The really odd thing was if I turned on the hazards the light would work just fine.
It was good for about a month or so and a few days ago it acted up again. Its been days now and it's still faulted and the light doesn't work with the hazards on anymore either. It's on but extremely dim. BMW told me to just replace the bulb, since my nearest dealer is 2 hours away.... What grounding cable is faulty? Is it something that I can just tighten?
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