Problems with BMW Z4 2019 - Engine running rough and suspected defective boost pressure sensor

Hi, I can empathize with how you feel! I had the same problem with my 2017 BMW 4 Series. I'm not a mechanic, but when I had the same symptoms, it turned out to be a defect in the waste gate valve. The repair cost me 860 euros. The garage replaced the valve and since then everything has been running smoothly again. Have you checked your car for faults? Or any other information that might help? I'm sure we can find out together. Good luck!

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Hi, thanks for your reply! I haven't read my car for faults yet, I haven't had time yet. The waste gate valve sounds interesting, I wouldn't have thought that. But it could also be the boost pressure sensor, right? The symptoms somehow fit. I'll go to the garage tomorrow and have the fault memory read out. I hope to have more information then. Your repair costs of 860 euros still sound bearable. I hope it won't be more expensive for me. Thanks for your tip and your support! I'll let you know as soon as I know more!

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Hey, I just read your post and it reminded me of my own situation. I had similar problems with my BMW X3 from 2016 and also suspected that it was the boost pressure sensor. And indeed, after I took the car to the garage, my suspicions were confirmed. The boost pressure sensor was faulty and had to be replaced. I had the same symptoms as you describe. From the illuminated warning signal to the loss of power to the hissing and stuttering - all of this improved after the sensor was replaced. It was as if the car could breathe again, that was a huge difference! Replacing the sensor cost me around 300 euros, including labor. Based on my own experience, I would say that your assumption is absolutely correct. Ultimately, only the workshop can determine the exact fault, but it sounds very much like a defective boost pressure sensor. Hope this helps you and you get your problem solved quickly. I would be happy to receive an update on whether it was actually the sensor. All the best!

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Hey, thanks for the information! That really gives me hope that it might not be as complicated as I feared. A faulty boost pressure sensor definitely makes sense and would explain all the symptoms. I'll ask the garage to check that first. It's good to hear that it was a relatively simple and inexpensive fix for you. I'll keep my fingers crossed that it's the same for me. Your experience helps me a lot and I'm a bit more reassured now. I'll keep you posted and let you know what the workshop finds out. Thanks again for your support and your tips! See you soon!

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Hi, have you ever read out the fault memory? A quick look under the hood may also help, perhaps you can see traces of a marten, they like to nibble at the air pipes... MfG

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How do you do? That sounds like a pretty annoying situation with your 2019 Z4 BMW. The symptoms you describe do indeed indicate a problem with the boost pressure sensor, but could also have other causes such as a leak in the charge air system, a faulty turbocharger valve or even a problem with the fuel supply. I had similar problems with my BMW and in my case it was actually the boost pressure sensor. The garage did a diagnostic first to make sure it really was the sensor. Then they replaced the sensor and checked all the connections in the charge air system to make sure there were no leaks. They also checked the turbocharger valve to make sure it was working properly. The cost of the diagnosis and replacement of the sensor was around 400 euros for me. However, the exact amount can vary depending on the garage. It's important that you find a trustworthy garage and get a clear cost estimate in advance. I hope this helps you and that your Z4 will soon be running as usual again!

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