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Is it the same sensor you replaced? Did the new sensor come with a Porsche connector, or did you have to splice the old connector on?
Could be bad if it was low quality (stick with Bosch). It could also be a faulty connection. I'd start with pulling the connector, visually inspecting the pins (clean with contact cleaner), then reconnecting (make sure the cam lock is fully seated).
Also check the wiring to make sure it isn't rubbing anywhere or loose enough to touch the exhaust.
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