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Look for the cheaper solutions before throwing parts at the problem.
Any recent work? Anything not stock? All hoses snugged up and attached? Any sign of a hole in any of them?
The rearmost O2 sensors are not normally the ones to go first. They can be checked for resistance or shorts and there can be a fuse or wiring issue. They can also be swapped to see if the problem follows the part. If you have to replace, use Bosch parts as they are the ones Porsche buys. Use the ones with pigtails included.
The MAF is an expensive part (clean only with MAF cleaner).
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