I'm not familiar with the values on these cars, including the MAF value, so this may be off the mark, but...
It could be too much air, or also too little fuel?
Blocked injector/s, low fuel pressure, bad fuel pressure regulator.
But the car runs ok?
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2001 Boxster S, TipTronic in Seal Grey aka "The Imp"
2001 TE50, ESS in (now) Grigio Titanio Matallizzato aka "The Golden child"
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