Parts and tools you can buy here: https://amzn.to/3SQXjRM

The VANOS units are located on the front of the cylinder head and have the unique function of making small adjustments to the intake and exhaust camshafts while they are rotating in a running engine. The BMW VANOS units make these "variable" adjustments to the spinning camshafts in a very clever way; they harness hydraulic oil pressure to move a splined plunger gear back and forth on the end of the camshaft. When the splined plunger gear is extended, the camshaft timing is advanced slightly creating "valve overlap" and a more efficient running motor. When the splined plunger is retracted, the timing is retarded creating more engine power.
Use only original BMW part as the other brands part may not be working properly.

Genuine BMW part Number: 11367585425

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