Please check fitment notes & description for accurate information. 2003 BMW 330Ci 3.0L 2003 BMW 330i 3.0L 2004-2005 BMW X3 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 Exhaust emissions reach undesirable levels. How to install the oxygen sensor? .
