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I replaced mine only because it was 25 years old. It was working fine but I did not want to wait for it to fail. Think of all the heat cycles it has endured for 20 something years. I don't know what the designed life of that sensor is, but I did not want a failure while out on the road. I bought the head sensor, O2 sensor & both reference sensors because they were all original. I feel better knowing they have all been replaced.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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