[WRichieX]

Hey guys, so I replaced my water pump and there was a crack in the seams of the expansion tank so replaced that as well. Did bleed procedure plenty of times. However, now my coolant low warning is always on. I was researching and could be a faulty tank but sensor as well. After researching, I noticed my sensor is not the blue bmw one. I have seen videos with the same color as mine but wondering if this is an aftermarket. Why are there different types of sensors on these bmws. To my knowledge, all original regarding the tank.