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your obd scanners wont show a vac. there is no vacuum pid for porsche. what you are seeing is some math that is being done based on a couple things but it wont be true vacuum.
Watch some youtube videos there are few on checking for vacuum but I think your issues will go away with real o2 sensors.
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2000 Boxster Tiptronic
2003 Boxster
2003 996 C2 Cab
2002 996 (SOLD)
1986 944 (gone but missed)
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