Please check fitment notes & description for accurate information. 2001-2002 Mazda 626 2.5L 2001 Mazda Millenia 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? .
