BOSCH POST CATALYTIC OXYGEN O2 SENSOR TO SUIT FORD FAIRLANE AU BA BF BARRA 182 190 MPFI SOHC 4.0L I6Post cat O2 sensors are manufactured using proven OE technology and are guaranteed to provide durable and efficient performance. The post catalytic oxygen sensor is located after the catalytic converter and monitors its efficiency by comparing the exhaust flowing into and out of the converter. This sensor helps ensure the lowest possible output of environmentally harmful engine emissions. This round plug post cat oxygen sensor suits Ford vehicles