It is not in the valve cover, as on other Focus engines. It is on the side of the engine, under the intake manifold, plugged into the "oil separator". It is possible to reach it from underneath, albeit blindly, if you have the car on a rack. The service manual suggests removing the intake manifold to get to it. The difficulty in reaching it may have something to do with the service schedule for replacement being set way out at 100,000 miles.
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