BMW 2-Series Power Loss: Lean Engine Symptoms & Solutions

Had the same issue with my 2017 BMW 3 Series last month. The symptoms matched yours exactly, power loss, rough running, and check engine light. Turned out to be a faulty fuel injector. Got it diagnosed at the garage and the scan showed the injector was spraying irregularly, causing incomplete combustion. The mechanic found carbon buildup and a cracked injector. This was actually quite serious since bad injectors can damage other engine components if left unfixed. In my case, they had to replace two injectors plus clean the intake. Looking back, I noticed the car had been using more fuel than usual for a few weeks before it got really bad, that was probably an early warning sign. Definitely get it checked soon. When they're testing the injectors, make sure they do a proper spray pattern test, not just a basic diagnostic scan. A specialist with the right diagnostic tools is worth it for these issues. Also had them check the fuel pressure regulator while they were at it, just to be safe. Good thing too, as the whole fuel delivery system needed inspection.

Thanks for sharing your experience! That's really helpful as it sounds exactly like what I'm dealing with. Quick question, do you remember roughly how much you ended up paying for the whole repair? And has everything been running smoothly since, or have you noticed any other issues pop up? Just want to make sure I budget properly and know what to expect.

Hey there! Yeah, after getting it fixed, my car's running like a dream now. The whole thing cost me 515 € to replace the faulty injector, but honestly, it was worth every penny. The engine's not running lean anymore, that was definitely the issue causing all our similar problems. Since the repair, it's been performing perfectly, smooth acceleration, no more rough running, and the power's back to normal. My fuel economy's actually better now too, which is a nice bonus. The check engine light hasn't come back on either, so that's a relief! I'm really glad I went ahead and got it sorted by a proper mechanic. My advice would be to not wait around on this one, those symptoms won't fix themselves, and you definitely don't want to end up with bigger engine problems down the line. Just make sure whoever works on it knows their way around BMW fuel systems. They need the right diagnostic equipment to properly test the injection system. But once it's fixed, you should be good to go!

Just wanted to update you all, I took my car to a mechanic yesterday and you were spot on! It was indeed a bad fuel injector. The mechanic found it after running some tests, and they showed me how the spray pattern was all messed up. Ended up replacing two injectors since another one wasn't looking too great either. The whole thing set me back about 650 €, a bit more than what you paid, but they also did a full fuel system cleaning while they were at it. Took her for a drive afterward and wow, what a difference! The engine's running smooth again, and that annoying power loss is completely gone. Check engine light's off too. Really appreciate everyone's advice here. Was nervous about choosing a mechanic, but found a good one who actually took the time to explain everything. They even showed me the old injectors and pointed out the carbon buildup. Definitely keeping their number for future repairs! Guess sometimes you just need to bite the bullet and get things fixed properly. Thanks again for helping me avoid a potentially bigger headache down the road!

Hello, my X3 has an LPG system and it has a loose contact from time to time and then it seems to run too lean for 2-3 seconds and the engine light comes on. On gasoline the engine light does not come on I have tried 6000 KM and on LPG the light comes on every 500- 1500 KM Unfortunately, I can not make the loose contact and therefore only engine light delete remains. Because it does not jerk and also runs normally Greetings Hans

(Translated from German)

Check the LPG system's wiring and connectors for any signs of wear or corrosion, as these can cause intermittent issues. Ensure all connections are secure and clean. If the problem persists, consider having a professional inspect the LPG system, as running lean can lead to engine damage over time. Let me know how it goes or if you have further questions!