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1987 944 Turbo changing PCV valve and oxygen sensor

Engine

Vehicle Information: Model(924/944/968): 944 Turbo; Year: 1987; Body Type: Coupe; Total Mileage: 41,545;

How frequently should the PCV valve be changed? Should the oxygen sensor be changed as a matter of routine maintenance or only if there is some indication that it may not be functioning correctly??

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