Question on BMW 3-Series E36 O2_Sensor

I just rebuilt my vanos and replaced my valve cover. 99 323i

Now I have an exterme buzz coming frommy ccv. When I pull the vapor return hose from the front of the VC and cover it with my thumb the noise completely stops. When I turn the car off it makes a Chewbacca noise.

I am wondering if the o2 sensors on my exhaust heads will trigger the ccv??

Just wondering because the wires to this o2 sensors were the only other thing I touched.

Thanks

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[Nick at Pelican Parts]

If the breather valve is making noise it is likely faulty. I would check crankcase vacuum and replace the valve if it is out f spec.

- Nick