N42/N46 Timing: Checking if VANOS units are locked

How to check if VANOS adjustment units are locked on a BMW N42/N46 engine.

How VANOS unit works and how to disassemble it: Inspecting & Cleaning VANOS - N42/N46...

How an unlocked VANOS unit looks like: :N42/N46 Timing: VANOS locked vs unlocked

Make sure VANOS units are locked before doing the timing.