BMW 4 Diesel Oil Sensor Nightmare: Warning Light Chaos

Hey there! I had nearly identical issues with my 2015 BMW 3 Series 320d last year. The oil warning chaos you're describing sounds exactly like what I experienced. When I took it to the garage, turned out the oil level sensor had corroded connections and was sending faulty signals to the system. The mechanic found that the wiring harness near the sensor was also slightly damaged, which caused those unusual warnings. The fix wasn't actually that serious, they replaced the sensor unit and repaired the wiring connections. Took about half a day's work. Since then, everything's been working perfectly, no more unusual warnings or issues checking the oil level. Based on the symptoms you've described, I'd bet you're dealing with the same problem. It's not a major mechanical issue, but definitely needs proper attention from someone who knows BMWs well. Worth getting it sorted soon before it causes any real headaches. Just make sure whoever works on it checks both the sensor and the surrounding wiring, that's where my real problem was hiding.

Thanks so much for sharing your experience! The sensor and wiring issue really sounds like what I'm dealing with. Can't remember, did you mention how much the repair ended up costing you? Also curious if you've had any other oil-related problems since getting it fixed?

Hey again! Happy to help with those details! Got my car back from the mechanic last week actually. I remember you asking about the costs, the whole thing came to 95 € to fix the cable and connection issues with the sensor. Pretty reasonable, considering all the warning lights it was throwing! And to answer your other question, nope, absolutely zero oil-related problems since the repair. The Oil level sensor signal fault is completely gone now. I can finally check my oil levels normally again, and my dashboard is back to being nice and quiet, no more Christmas tree light show! Honestly, it was such a relief to find out it was just a faulty connection causing all that drama. If your symptoms are matching what I had, you're probably looking at a similar fix. Not too painful on the wallet either, which is always a bonus with BMW repairs! Let me know how it goes when you get yours sorted, always interested to hear if others have the same experience.

Just got back from the mechanic, and wow, what a relief! You were spot on about the sensor and wiring being the culprit. My mechanic found corroded connections and a slightly damaged wire harness, exactly what you described. The fix was surprisingly straightforward and cost-effective. They replaced the sensor unit and fixed the wiring, and my dashboard is finally back to normal. No more unusual warnings popping up, and I can check my oil level again without any issues. The whole repair took about four hours and cost me around 120 bucks, definitely not as scary as I'd feared. The mechanic even showed me the old sensor and explained how these issues typically develop over time. Really appreciate you sharing your experience, it helped me feel much more confident about what needed to be done. It's been a few days now, and everything's working perfectly. No more stress every time I start the car! Thanks again for pointing me in the right direction.