Please check fitment notes & description for accurate information.2000 BMW 323Ci 2.5L1999-2000 BMW 323i 2.5L2001-2002 BMW 325Ci 2.5L2001-2002 BMW 325i 2.5L2001-2005 BMW 325xi 2.5L2000 BMW 328Ci 2.8L1999-2000 BMW 328i 2.8L2001-2002 BMW 330Ci 3.0L2001-2002 BMW 330i 3.0L2001-2005 BMW 330xi 3.0L2001-2003 BMW 525i 2.5L1999-2000 BMW 528i 2.8L2001-2003 BMW 530i 3.0L2004-2006 BMW X3 2.5L2004-2006 BMW X3 3.0L2001-2006 BMW X5 3.0L1999-2002 BMW Z3 2.5L1999-2000 BMW Z3 2.8L2001-2002 BMW Z3 3.0L2003-2005 BMW Z4 2.5L2003-2005 BMW Z4 3.0L Oxygen Sensor's Location: How do I know the O2 sensor is good or not? Check engine light on A reduction in fuel economy. Your catalytic converter fails unexpectedly .
