Please check fitment notes & description for accurate information. 1997-2008 Ford F150 All Engine Position: 2 pcs Upstream (Front) & 2 pcs Downstream (Rear) 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? .
