I had some codes a few months back, and I had good success getting rid of them by running a bottle of Techron in the gas. (Don't forget to change your oil after a tank or two).
Have you ever changed the spark plugs? '01 is getting up there in years. I just changed the plugs and wires on my '02S and the car runs noticeably better.
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SOLD - 2002 Boxster S - PSM, Litronics, De-ambered, Bird Bike Rack, Hardtop, RMS leak...
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