lytnin88 Posted January 5, 2006 Share Posted January 5, 2006 I have an '03 Forester with 68K miles. I noticed that it has two O2 sensors, a front and a rear. I think the rear one plugs into the catalytic converter. Does this one ever need to be replaced? Link to comment Share on other sites More sharing options...
cookie Posted January 5, 2006 Share Posted January 5, 2006 I think technically they both should be around 100,000 miles. The rear one has a much easier life as it just checks to see if the front one is doing the adjustments properly and I believe it operates in a cooler environment.On my Forester at 122,000 I have changed the front but not the rear. Link to comment Share on other sites More sharing options...
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