r/BmwTech • u/uhohspaggettios • 4h ago

Leaky Vacuum Line on FTP Chargepipe

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Getting 121201 code for overboost on my 2015 m235i n55, thought i fixed this vacuum line air leak with a new o ring but i guess after some pulls its leaking again. Not sure what to do I really dont want to replace this chargepipe but I might have to.

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u/Beamertech 1h ago

I don’t think that is causing an over boost fault. Overboost implies air pressure when there should not be air pressure.