I bought Spyder LED tails and fitted them and they worked straight out of the box. Of course this was prior to the "brake force indicator" brake lights days as it was on a '01 X5. The lights had built in capacitors to provide the correct reluctance to bias the LKM signal so no errors or quick flash problems were experienced..

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2021 X5 xDrive40i
2015 X5 xDrive35i MSport
(Traded) 2013 X5 xDrive35i