4pcs Upstream&Downstream Oxygen O2 Sensor For 2007-2010 BMW X5 xDrive48i V8 4.8L
$88.77
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.
