BMW Diesel Misfires: RQD Error Signals Fuel System Fault

Hey there! I had the exact same issue with my 2009 BMW 530d (similar engine family). The symptoms were identical, rough running, misfiring, and that dreaded check engine light. Last month, my mechanic confirmed it was a faulty fuel injector. One of the injectors wasn't atomizing the fuel properly, causing incomplete combustion. The injector had internal wear and was leaking slightly. This isn't something you want to ignore, it can lead to bigger engine problems if left unchecked. In my case, they needed to replace the problematic injector and reset the injection control unit. The diagnostic equipment showed the injector wasn't responding correctly to the electronic signals. They also cleaned the other injectors while they were at it. It was definitely a serious issue that needed immediate attention. Running with a bad injector can damage your engine and affect other components. These precision parts are crucial for proper engine operation. My advice? Get it fixed at a shop that specializes in German cars. They'll need proper diagnostic equipment to code the new injector to your engine management system. Hope this helps with your decision.

Thanks for sharing your experience with the injector problem! That's super helpful and sounds exactly like what I'm experiencing. Definitely going to get it checked out asap. Quick question, do you remember roughly how much you ended up paying for the whole fix? Also, has everything been running smoothly since the repair, or have you noticed any other issues pop up?

Hey again! Glad I could help! After seeing your follow-up, I wanted to let you know that since getting it fixed, my BMW has been running like a dream, absolutely no issues whatsoever. The Reset Quantity Drift Compensation error is completely gone now, which was such a relief. For transparency, the total repair came to 515 € for replacing the faulty injector. I know it's not cheap, but considering how smooth the car runs now, it was totally worth every penny. The rough running and misfiring issues disappeared completely after the repair. Just make sure whoever works on yours knows what they're doing, these injectors are pretty complex and need proper coding to work with the engine management system. But once it's done right, you should be good to go. Trust me, you'll notice the difference right away. My car feels like new again, no more worrying about that check engine light or rough running. The peace of mind alone was worth the investment! Let me know how it goes with yours!

Thanks so much for all the details! I bit the bullet and took my car to the mechanic yesterday. You were spot on about everything, it was indeed the injector causing all the trouble. Got it replaced and wow, what a difference! The final bill came to a bit more than yours, around 600 €, but honestly, I'm just relieved it's fixed. The mechanic I found was really thorough and showed me the old injector, it was pretty worn out. They did the coding and everything, just like you mentioned. Took it for a test drive after, and it's like driving a completely different car. No more shaking, no more check engine light, and the engine runs super smooth now. Guess I was lucky to catch this before it caused any major damage! Really appreciate you sharing your experience, helped me make the right decision instead of putting it off. I'll definitely keep an eye on the maintenance schedule from now on!