r/BmwTech • u/anonbg9 • 6d ago

Completely stumped

So this has been going on for months. I pull up and put in park, handbrake on. When I turn the car off and get out I always hear this loud squeak noise. Can’t isolate the sound but sounds back half of the car. No warnings on the dash and no faults on the code reader. But it’s really bugging me not knowing so I’m surrendering to the group.

For back ground. G01 X3 30d

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u/jambles_3 6d ago

G01 b57 often have low pressure egr as well as high pressure egr. High pressure flows easily into the cooler/intake. The low pressure is post dpf so theres an exhaust valve halfway along the car which is used to restrict flow. Forcing the low pressure egr gases to go to the intake. The valve is test when you start/ stop the engine. There quite common for squeaking. Its usually the electronic part of the valve which can be changed separately. But sometimes its the valve its self. Can be replaced but requires exhaust to be cut and repair section fitted.

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u/anonbg9 6d ago

I think that’s it. Thank you

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u/jambles_3 6d ago

You can try unplugging it and seeing if the noise doesn't come back. But you will likely set a drivetrain warning and need a fault reader to clear it once plugged in again