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The Problem: The DISA valve, otherwise known as the Intake Manifold Adjuster Unit, is located on the side of the intake manifold and is a common failure on the M54 BMW engines. The failure is caused by the type of materials used in the manufacture of two of the three key valve components.
The canister purge solenoid valve also serves as a diagnostics tool used to troubleshoot the emission system. The valve is able to be manually shut to test for leaks in the system. The canister purge valve is difficult to diagnose since its failure can cause other sensors from the emission system to malfunction.