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Is the car running normally other then this code?
Ok, usually when this is the case the actual code is caused by a front O2 sensor that's reading out of range. It's seeing a lean mixture, but it may not be lean at all. What you really have to do is get a scan tool that can read the live data from the front and rear O2 sensors, then check to see what they are reading. Usually though the front O2 is the culprit causing the lean fuel mixture. This of course will cause the code to come up. Other things can do this, but when it seems to be running fine, I find it's usually this sensor.
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