BMW X4 Timing Issues, Sensors or Something More Serious?

Hey there! I had similar issues with my 2012 BMW X3 (had some experience working on cars). The symptoms you're describing sound exactly like what I went through last year. The metallic sounds and timing codes had me worried it was something major at first. Turned out to be a faulty crankshaft position sensor. Got it diagnosed at my trusted workshop, they confirmed it with their professional diagnostic tool. Total repair cost was around 340 Euro including parts and labor. Since fixing it, the engine's been running smoothly, no more check engine light, and fuel consumption is back to normal. Before I can give more specific advice, could you share: Exact engine variant? Current mileage? Are there any other warning lights? Does it stall or misfire? These details would help me point you in the right direction since BMW engines can be a bit tricky with sensor issues.

Mine's at 116591 KM and just had its service last month. Had almost identical symptoms, rough cold starts, timing codes, and that annoying metallic noise. My mechanic first thought it was the camshaft sensor, but after further testing, it turned out to be the VVT solenoid that was failing. Replaced that plus the sensors as preventive maintenance since they were original. Engine's running like new now, much smoother and quieter. Cost me about 500 Euro total, but worth every penny since it fixed all the issues. The shop said these problems are pretty common on our X4s around this mileage.

Yeah, glad I could help earlier! And thanks for sharing those details about your X4. Actually, I need to correct my initial suggestion about the crankshaft sensor on my X3, turned out I had a similar follow-up issue a few months later. The VVT solenoid replacement you mentioned really hit home because that's exactly what ended up happening with mine too! After fixing the crankshaft sensor, everything seemed fine for about 3 months, but then those same symptoms started creeping back. Had that same annoying metallic noise during cold starts. My mechanic did a more thorough diagnosis and, just like in your case, the VVT solenoid was the real culprit. Should've just done both repairs at once like you did, would've saved me time and probably some money too. My X3's running great now, but these BMW timing systems can be tricky to diagnose. Learned my lesson about going for the complete fix rather than just replacing parts one at a time. Those VVT solenoids seem to be a common weak point in these engines, especially around the 100K mark. Definitely worth keeping an eye on for other owners reading this thread.

Thanks for sharing your experience and the follow-up info about the VVT solenoid issues. It's really helpful to know I made the right call getting both components replaced at once. Looking back, I probably saved myself from having to make two separate trips to the mechanic, which would've been more expensive and time-consuming. My X4's been running perfectly for the past few weeks since the repair. No more strange noises during cold starts, and the engine feels much more responsive. Fuel economy's back to normal too. Really glad I posted here, your initial response about the crankshaft sensor got me thinking in the right direction, even though it turned out to be the VVT solenoid in the end. For anyone else with a similar BMW engine having these symptoms, definitely get it checked out sooner rather than later. And like you suggested, it's worth considering replacing both components if you're already at high mileage. The peace of mind is worth the extra cost, and it could save you from dealing with repeated issues down the road. Again, thanks for the help. It's great to connect with others who've dealt with similar issues!