I have a 2014 X1 28i that will make a random clicking noise.  Opening the rear doors or at times it does it without known cause.  Sounds like a relay, perhaps on the pass side engine compartment.  Any ideas out there

Morning John

Welcome to the Forum

Could be part of the re-circulation systems for cooling turbo etc? I have to say I have not heard this before so that is a guess

 Dave

It is different.  Seems that it may have to do with movement of the car.  is there an anti theft system that could have a tired relay?  We had the car for just a few days so aren't sure of all the systems or symptoms . 

Morning John

If you haven't had it very long and it's a worry back to the dealer and ask?

Dave

Private sale and they were unable to identify it or have it diagnosed.  It is quite random.  Thinking it might have to do with a faulty alarm system?? 

Afternoon John

First what tyres are fitted?? This is important your car is Xdrive if the tyres do not match across axles or front to rear it will cause transmission wind up this in turn will damage the Centre transfer box and eventually first the rear and/or front differential. This not a BMW issue ALL 4x4 vehicles have it.

If you turn off the engine after driving and here a clicking sound from under the car that is the transfer box protesting as it tries to reset, if you reverse slowly on full lock and you feel snatching/jerking that is a very unhappy xdrive system. A new diff (Front or Rear) will be around £900 + Fitting a Transfer box can be repaired there are several specialists but still not cheap. A complete set of tyres will be cheaper.

I stress all 4 tyres should be at about the same tread depth from the same manufacturer with the same tread pattern, preferably " * " marked on the side wall. If they aren't then you have an issue that will just get worse if it hasn't caused to much damage already. Inside the transfer case is a nylon gear that adjusts torque front to rear, if tyre rolling radius doesn't match front/rear and across axles that gear can be stripped producing a clicking sound

Sorry to say the previous owner may have known

Dave