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The problem with attempting to clean oxygen sensors is that they get a carbon buildup and they're "burned" a little or a lot. There's hardly any way to clean them without scratching the carbon off and then you will damage the sensitive coating on the sensor itself.
I think they're replace only. The MAF is really the same way, but since it's not on the exhaust side it doesn't have carbon buildup and cleaning it can work some times.
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