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2021 840 I dash lights dim without warning


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Morning Donald

Welcome to the Forum

As your car is at best just over a year old I would be much harder with the Dealer as it is their responsibility to supply a vehicle that is "suitable for purpose" and a very expensive car should have "everything" working correctly, no faults.

I would ask what they had done to check the fault, a software test is not good enough what physical tests did they do and what plan is in place to rectify the problem,

Good Luck

Dave

 

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Stupid question, but are your lights set on auto? 
the dash lights will dim when the exterior lights come on. 
is it doing it when the car is stationary? 

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