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Author of "101 Projects"
Join Date: Jan 1995
Location: Rolling Hills Estates, CA
Posts: 27,056
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As the sensor gets older, it's readings can change (from carbon buildup, the stress of heating/cooling, etc.). It's one of those things that should be replaced every 60-80K or so, based on average wear rates. Preventative maintenance like this will keep your car running well, and will also protect your CAT if it fails.
You don't really want to wait until it fails, as it will make the car run very rich, which can quickly damage your CAT while you're trying to figure out what is causing the problem
-Wayne
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