If you've spun your tires excessively lately, or held your engine at a high idle to warm it up in the morning, these conditions could have thrown that code. Mine starting throwning that code since winter started, which coencides with me holding my rpms at 1200 in the morning to help it warm up. I'm hoping that once warmer weather comes around and I don't hold it at fast idle anymore, it'll quit logging that code. I even went as far as to go down the turnpike and compare my odometer to the mile markers, and it was dead on, so I don't think I'm really having a problem with the sensor itself. You might want to check the harness going to the sensor though, I've heard of some people having problems with it getting damaged and logging that code.