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At 64k miles one O2 sensor went and it was replaced. At 70k at 2nd one started giving me intermittent CELs. I read here that it's best to change all 4 at once, so I changed the remaining three even though the car was running fine, and experienced a noticeable improvement overall in driveability.
O2 sensors tend to fail around the same time. If you're planning to hang onto your car for a while, best to just change them and get it over with, or they're likely to come back and haunt you at an inopportune time. I got them with the OEM type connectors from Maxspeed Motorsports for $99 each, which was the best deal out there at the time (last fall).
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