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I'm assuming you replaced all four sensors. Replacing just one or two will throw a CE because the new ones are quite sensitive and the old ones are not.
If you did replace all four, do remove and clean the MAF and clear the codes. Sometimes when a MAF is going bad or dirty, the computer throws a code for one of the O2 sensors.
Makes no logical sense whatsoever, but my mechanic showed me on his PST tool how a dead O2 sensor made the MAF look as if it were failing and the other way around as well.
He said, "Ihres Porsche computer ist verwirrt!"
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