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Originally Posted by 94x4
"gohawks", "etgunner", you guys could try to save a few (read as: bunch of) dollars by pulling the 02's out and burning the buildup off of them with an acetylene torch, scrubbing them down with a steel brush and perhaps spraying them down with some quick drying, electric parts cleaner to remove whatever remaining residue, and then popping them back in. 
It either may or may not be necessary to pull the fuse to reset the circuit, depending on your year, although I'm not certain. 
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This may or may not work and requires some technique to do (has been covered already in a few threads) because the part you need to clean is actually underneath the tip of the O2 sensor (not the tip itself). The only no brainer way, which is guaranteed to work is to replace with a new one. You can bench test the sensor with a torch to see if the sensor is indeed the problem before you replace it (but for most, if you do the work to get it out, you might as well replace it too).
If you want to try testing and cleaning, here is a good thread for you:
http://yotatech.com/showthread.php?p=521317#post521317