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Yes, there's no other way. It's a pain in the neck, but it is possible even for a DIY'er with ambition but not much experience (me). If you Google a DIY on the project for the Ford Duratec 2.3 engine it pulls up a link where some guy provided a fair amount of detail on the project on the same engine. There are bolts on the manifold that have to come out from the top side and from underneath the car. The Mazda tech repair manual recommends replacing the four intake gaskets too as long as you've got the thing off. Good luck.

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Q: Do you have to remove the intake manifold on a Mazda 6 4 cylinder 2.3 L to reach PCV valve?
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