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The DISA valve (also known as the air adjustment unit) controls the path of air through the plenum, regulating the intake manifold pressure to provide greater torque around town and more power at higher revs. Unfortunately these are a weak point and can often break, causing the flap to get stuck and allowing debris to potentially enter the motor unfiltered. Located next to the intake manifold, replacement is a relatively simple procedure, and should be replaced as part of good preventative maintenance. This replacement DISA valve units from Germany's Vaico are high quality and a fraction of the cost of a BMW Genuine replacement.
Please note: Part numbers are provided for reference only. For correct compatibility to your vehicle, please follow our fitment advice