What is the relation of changing Oxygen sensor and replacing exhaust pipes pluck

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Is there a problem check it out and discover that exhaust pipes blocked which coused problem in the car engine , my car is Panomera 4S 2012 model , I replaced before thermostat casing before is ther is any related to that damage. What seems to make the problem better or worse? Whenever I repaired some thing in the Porche work shop I should back again in something else How long have you had this problem? 2 months ago