I had the same codes and went through several cycles of cleaning, same as with you it looked good
Well, after I finally replaced it the codes went away and never came back ...
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I still wave at Boxsters, but they no longer wave back :-(
2002 Boxster S "Violet" (sold but not forgotten)
2009 Carrera 4S "Kelsey" (current ride)
2015 FIAT 500e "Nikki" my commuter car
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