I had the same problem as of this week, it may be the MAF that causes that. The shop that I took my car, had Porsche diagnostic computer and he check each individual O2 sensors voltage and did not see any problem with it. O2 and MAF are all expensive parts, so you may want to be sure that you are replacing the right part.
Do you have aftermarket cold intake on this car (like EVO)?
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MetBlack-S
Factory side skirts
18" Sport Classic
B&M short shifter
IPD Cayman-S Plenum
80mm Throttle Body
FVD Sport Muffler
Fabspeed catbypass
EVO Intake
PSS9
Light flywheel and Sach stage II clutch
Front/Rear Strut Brace
Undetectable K40/3
Rear Defuser
Rear spoiler
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