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Mine is going to need a new vacuum canister as the old one was so brittle, it was falling apart.
Also, BMW has a service bulletin for these. It's SI B12-10-09 and I have attached it below:
SI B 12 10 09
Engine Electrical Systems February 2009
Technical Service
SUBJECT
E90, E70 M57Y Diesel - Diagnosis for DDE FC 4521/4530
MODEL
E70, E90 with M57Y engine
SITUATION
The Service Engine Soon lamp is illuminated (with a "Reduced Engine Power" message displayed in the CC), and one of the following fault codes may be stored in the DDE control module:
4521 – Charge air pressure control, control deviation, charge–air pressure too high
4530 - Charge air pressure control, control deviation, charge–air pressure too low.
CORRECTION
The possible causes for the induction undercharge/overcharge faults are:
Charged air leakage between the turbochargers and the intake manifold;
Air filter or air path before turbocharger clogged;
Incorrect operation of turbochargers actuators (low vacuum supply for wastegates, compressor bypass valve jammed, etc.);
Intake manifold pressure sensor malfunction;
Excessive backpressure in the exhaust system.
IMPORTANT:
Do NOT perform the ISID test module B1365_D7LMS (Air Mass System Test) which is called for the faults 4521/4530. The test module, in its current version, is not applicable for the M57Y US engine version and may produce implausible results, leading to unnecessary component replacement. Test module B1365_D7LMS will be corrected with future releases of ISTA/D.
In case fault codes 4521 or 4530 are stored, perform the following test modules:
B1362_D6TRK (Turbine control flap – wastegate control of the smaller turbocharger);
B1362_ D6WGV (Turbine control flap – wastegate control of the larger turbocharger);
B1362_D6VBK (Multistage turbo charging – US diesel).
To check the integrity of the intake system, perform the smoke test, using BMW approved smoke generating equipment (VACUTECreg; Smoke Machine 625-522B-BMW).
Refer to SI B16 01 07 for detailed information related to the VACUTECreg; Smoke Machine 625-522B-BMW.
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