It's in the case halves, so it's under the intake manifold. It's a large stick with an electrical connector on top, that screws into a boss in the case.
You may be able get a wobble socket on a long extension between the runners, but I'm not sure how'd you get your hand down there to unclip the connector or pull the actual sender out. Unfortunately I think you're going to have to remove the manifold to get at it.
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Boxster S
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