How do I know the O2 sensor is good or not?. 234-4071(4-wire Oxygen Sensor): Downstream 1X. 3.0L V6 2001 2002 2003 2004 2005 2006 2007 2008. B3000 3.0L V6 2001 2002 2003 2004 2005 2006 2007 2008. If the sensor is good, further diagnosis is required.
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