For 2009 2010 2011 Ford Expedition 5.4L 4X Upstream+Downstream Oxygen O2 Sensor
$81.41
Oxygen Sensor. Q: How do I know the O2 sensor is good or not?. 4 x Oxygen Sensor. If the sensor is good, further diagnosis is required. There're many different codes for specific functional failures, which are NOT necessarily relevant to the sensor.
