[msiladin]

I just suffered the same tail light error issue on my 2016 m235i. Similarly to others I first saw intermediate and then pretty much consistent errors related to the passenger side tail light. At first the dealer thought the there was an issue with the battery - because they saw voltage related battery errors. So they replaced the battery and pronounced it fixed. However, the tail light errors appeared again. The dealer gave me a loaner and looked at it again. They called me and explained that the ground cable had oxidized (burned, not related to moisture). They indicated that the new housing now had 2 instead of only 1 ground wire.

They did not replace the driver side tail light. They said they would do so if it failed. The repair was covered under warranty (I only have 26k on it)