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O2 sensors can be done with a special wrench designed to let the wires pass through the opening in the wrench. Once you have read the codes (and thus know which one is faulting) and, if you don't want to do the job yourself, I found any muffler shop can do it in 15 minutes if you have the part. Most of that time is waiting for the exhaust system to cool down.
And the parts are made by Bosch and then relabeled by Porsche so buying the appropriate Bosch part number gets you the exactly right part for much less money. List of part numbers towards the .
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