As you said, when turning the key to position 2, cold monitoring starts checking the lights (bulbs). In my case, the three led bulbs without the capacitors flickers (strobe effect) for some seconds. The other with the capacitor, does not. The same for the led tail lights, with adaptative brake, which flickered (no strobe effect) while the car was on, got it solved with the capacitor.

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BMW E53 4.8 IS 2006 -