BMW X5: Rough Idle & Limp Mode, Need Diagnostic Help

Hey there! I've got some experience working on cars (let's say medium level DIYer). Had a super similar issue with my 2015 BMW X3, and my also went through this with his 3 Series. Turned out to be a nasty exhaust leak that was messing with the O2 sensors, causing those exact symptoms, rough idle, jerking, and limp mode. My trusted mechanic found cracks near the manifold that were letting exhaust gases escape. The fix cost me about 265 Euro, including parts and labor. After the repair, it was like driving a different car, smooth as silk, no more CEL, and passed emissions no problem. But hey, before jumping to conclusions, could you share: Current mileage? Any unusual sounds or smells? When did these symptoms first appear? This would help me figure out if you're dealing with the same issue I had.

Thanks for sharing your experience! I'm at 102166 KM and just had my service last month. Haven't noticed any weird smells, but there's definitely a slight rattling sound when idling. It's gotten worse over the past week, especially in the mornings. My symptoms sound really close to what you described with your X3. Good to know it might be exhaust-related and not something catastrophic. That repair cost sounds way better than what I was worried about. Did you notice if the rattling got worse when the engine was cold? Just trying to confirm if I'm dealing with the exact same thing before booking a shop visit.

Hey again! Thanks for those extra details, yeah, this is sounding more and more like what I dealt with on my X3. The cold engine rattling? that's exactly what mine did! It was super noticeable in the mornings, just like yours. Would rattle for maybe the first 5-10 minutes until everything warmed up, then it would get a bit quieter but never totally smooth. The timing of your symptoms matches up perfectly too, mine also started getting progressively worse over about a week or so. With your mileage being pretty close to what mine was when this happened (I was at around 98000 KM), I'm even more convinced it's the same exhaust leak issue. The fact that you just had service but these problems started after is interesting, sometimes the heat cycles and vibration can make small cracks in the manifold suddenly get worse. Quick tip from my experience, when you take it to the shop, ask them to check the manifold gasket too. My mechanic found that while it was the crack causing most of the trouble, the gasket had also started deteriorating. Getting both sorted at once saved me from potential future headaches. Stay in touch and let me know what your mechanic finds! Always curious to hear if these BMW issues follow the same patterns.

Thanks so much for all the details! You've totally convinced me it's probably an exhaust leak, especially with that morning rattling being so similar. I'll definitely get it checked out this week and ask about both the manifold and gasket like you suggested. The whole cold start behavior and progression of symptoms is just too similar to ignore. I'll be sure to update once I get it looked at. Really appreciate you taking the time to share your experience, it's made me feel way better about this whole situation. Was worried I'd be looking at some crazy expensive repair, but this seems pretty manageable. Fingers crossed it's the same straightforward fix you had with your X3! Will save your advice about getting both the crack and gasket checked, sounds like solid preventive maintenance. Thanks again for helping me narrow this down before heading to the shop. It's great having someone who's been through the same thing!

Hi there, quick question I just got an error engine 003104 Description: DME: Smooth running, stratified charge drive. Can anyone help me how I can fix this?

(Translated from German)

Start by checking the spark plugs and ignition coils, as these are common causes for misfires and rough running. Inspect them for wear or damage and replace if necessary. If the issue persists, it might be worth checking the fuel injectors for clogs or leaks. Let me know how it goes or if you have any further questions!