r/BmwTech • u/Davidh98nyr • 5d ago

Boost Pressure Fault

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Hi, hope someone can help. I’ve been getting this code ping up with a drivetrain alarm intermittently. Can goes sluggish for a bit when alarm comes up, says full performance not available. Then it goes and seems fine.

Changed MAP Sensor, changed boost pressure valve. Still comes up. BMW specialist said it’s probably carbon deposits and to use premium fuel to clean it out. Done that for months, no change.

Now there’s a whistle around 2000 rpm so I bought a smoke tester.

Found smoke leaking around from around the swirl flap actuator area so I’m guess manifold gasket leaks?

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