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what tool are you using to get the data? using a porsche tool you should get two readings:
FRA which is the closed-loop load value and is a number that can be between 0.7 and 1.32 before you get a code.
RKAT which is the idle value and can be between +/-4% before code.
vacuum leaks will usually impact idle before load as the small amount of air has a bigger impact when idling than when at load sucking in a lot of air.
load trim issues are often due to fuelling.
bad sensors (o2, maf) can get you too.
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