Reply to thread

Message: <blockquote data-quote="2slo95fiveoh" data-source="post: 611667" data-attributes="member: 8966">Upstream sensors are before the cat (as already mentioned) but they also have a heating element in the sensor,making them a little bit more expensive than downstream sensors (not equiped on 94-95 5.0). If a car has only 1sensor per bank of cylinders, they're usually upstream sensors. Auto Parts stores will carry a listing for downstreamsensors on 94-95 5.0s, but your local Ford dealership won't. And X2 on buying OEM ford O2 sensors.. mine lasted until115K when one started crapping out, so i replaced them as a pair.</blockquote>