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For whatever reason I bought both of my civic vx's with bad o2 sensors, my first one has around 70,000 miles on it's "new" o2 sensor and it's about 5 years old now, my current VX has around 30,000 miles on it's new o2 sensor, going on 3 years, but both cars had their sensor go bad when the car had around 190,000 miles and was around 15 years old.
The "normal" part of the sensor seems to work fine, but the part that picks up on the lean burn seems to be what goes bad after 190,000 miles/15 years, so I'm not sure what is special about that part of these 5 wire sensors but I guess it's also part of why they are a $185 to $300 part instead of a $30 part.
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