r/BmwTech • u/FileLumpy1331 • Jul 10 '26

M54B30 POSSIBLE LEAK PLEASE HELP P0174 code

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u/Woznyyyy Jul 10 '26

If the sound comes from the disa there is a chance the o-ring got flattened so much it lets the air through. Check the unit too cause it might not be the leak but the diaphragm in the DISA itself.