BMW X2 Diesel's Boost Issues: Power Loss & Hissing Alert

Hey there! I had nearly identical issues with my 2019 BMW X1 20d last winter. The symptoms were a carbon copy of what you're describing, power loss, whistling, rough idle, and terrible fuel economy. Turned out to be a faulty wastegate actuator on the turbo. Had it diagnosed at a garage where my friend works. The wastegate wasn't regulating boost pressure properly, which explains the whistling and power issues. The repair involved replacing the entire wastegate assembly. It was quite a serious issue since running with a bad wastegate can potentially damage your turbo over time. My advice? Don't wait on this one. The symptoms won't improve, and you risk more expensive repairs if the turbo gets damaged. Make sure to find a garage with BMW diagnostic equipment, as they'll need to recalibrate the new wastegate after installation. It took about a day and a half to fix mine, but the car's been running like new since then. Zero issues with boost or fuel economy for the past 8 months.

Thanks so much for sharing your experience! This definitely sounds similar to my problem. Really glad to hear you got it sorted. Quick question, do you remember roughly how much the wastegate replacement set you back? Also, have you had any other issues pop up since the repair? Just trying to get an idea of what I'm in for.

Hey again! Just wanted to give you an update since I know you're dealing with the same headache. I took my X1 to the mechanic last week and, yep, got it all sorted! The bad boost pressure system was indeed the culprit, specifically a defect in the wastegate valve. Set me back 860 € for the whole job, but honestly, it was worth every penny. The car's running like a dream now, no more whistling, power's back to normal, and fuel consumption is way better. Been driving it for about a week since the fix, and I haven't had a single issue pop up. Really happy I didn't wait any longer to get it fixed. Honestly, given how similar your symptoms are to what I experienced, I'd say you're looking at probably the same repair. The price might vary a bit depending on labor costs, but at least now you've got a ballpark figure. Trust me, better to get it done now than risk more expensive turbo repairs down the line! Hope this helps with your decision-making! Let me know if you need any other info.

Thanks for the detailed follow-up! I bit the bullet and took my X2 to a different mechanic yesterday. You were spot on, it was the wastegate causing all the trouble. Ended up costing me a bit more than yours, but the mechanic showed me the worn-out parts and explained everything clearly. The best part? Just picked up the car this morning and what a difference! The whistling's completely gone, it's got all its power back, and it's running super smooth at idle. The engine light's off too. Such a relief to have it sorted. Really appreciate you sharing your experience, it gave me the confidence to get it checked out before things got worse. The mechanic mentioned I made the right call coming in when I did, as the turbo was starting to show signs of stress. Guess sometimes you just need to find the right garage. This new place seems much more professional than my old mechanic. Think I'll stick with them from now on! Thanks again for all your help!

Please halp! 😊 What does this error mean? It appears on the display as “Drive Train,” and I lose some engine power. However, when I turn the car off and on again, the error disappears but later reappears.

Bmw f20 2012, 114i

The "Drive Train" error message on your BMW F20 can indicate various issues, often related to the engine or transmission. Since you're experiencing a loss of power, a common cause could be a faulty sensor, such as the mass airflow sensor or a turbo-related issue. Start by checking for any stored error codes using an OBD-II scanner, which can provide more specific information about the problem. If you don't have access to a scanner, consider visiting a mechanic to diagnose the issue accurately. Let me know how it goes or if you have any further questions!

Check the air intake system for any loose or damaged hoses, as this can cause the "Drive Train" error and power loss. If everything looks fine, it might be best to have a mechanic inspect it further, especially if the issue persists. Keep me updated on your progress or if you need more help!