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02 sensor relay

Engine

Vehicle Information: Model: 911 Carrera; Year: 1984; Body Type: Coupe; Engine (type, size, modifications): 3.2; Total Mileage: 36,xxx;

Just curious - found out recently about an oxygen sensor relay (821 951 253). Where is this located and what is it's purpose and how does one tell if it is functioning properly? Thanks!

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