Please check fitment notes & description for accurate information. 2003-2006 BMW 325Ci 2.5L 2004-2005 BMW 325i 2.5L 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? .
