Bmw x3 common problems engine oil leaks valve cover gasket sunroof rattle and leak timing chain guide failure window rattle and broken regulators overheating from radiator and expansion tank leaks. Are you having problems with your bmw x3 diesel let our team of motoring experts keep you up to date with all of the latest bmw x3 diesel issues faults we have answered all of the most frequently asked questions relating to problems with the bmw x3 diesel. Diesel engine problems of the 2015 bmw x3 one problem related to diesel engine has been reported for the 2015 bmw x3 the most recently reported issues are listed below diesel engine problem 1 failure date 05 01 2018 check engine light on diesel engine come on multiple times since car hit 40k miles. The last cause of concern in the bmw x3 for this year was the engine problems with the nhtsa complaining regarding the engine mount bolt failure oil leaks and the vehicle speed control