N54 making 0 boost after vaccum lines, solenoid, and CP

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		BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i) > Technical / Specific Topics > 135i Turbo Engine (N54 / N55), Exhaust and Drivetrain Modifications
N54 making 0 boost after vaccum lines, solenoid, and CP

03-01-2026, 11:20 PM	#1
e82.real Registered 2 Rep 1 Posts Drives: BMW 135i Join Date: Mar 2026 Location: WA iTrader: (0)	N54 making 0 boost after vaccum lines, solenoid, and CP I just got a 2009 135i, and it has been throwing a half cel, and a 30ff code. I went through and replaced some vacuum lines, charge pipe, boost solenoids, and the issue prevails. Smoke test didn't show any faults, and all the hoses are connected. I have the jb4, and can see that its making 0 boost. could the turbos be shot? there's no wastegate rattle so maybe they are stuck open? if you have any input or knowledge on this, please let me know what to check!
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