So if there are (4) O2 Sensors on a 2000 Ford Expedition 4.6, then how many upstream and how many downstream sensors are there?

Asked by Sep 10, 2014 at 01:55 AM about the 2000 Ford Expedition XLT 4WD

Question type: Maintenance & Repair

o2 Sensors and which ones, Upstream or downstream?

4 Answers

31,975

There are 4. Do yourself a favor. Replace all of them at the same time. That way you will only have to go to the parts store once and crawl under the vehicle once.

31,975

But if you are going to replace only the down stream O2 sensors they are the ones closest to the back of your Expedition.

That was what I was going to do,,,replace both downstream and upstream O2 Sensors. Thanks for the second opinion.

4,615

Simple guide... upstream is toward front of car, downstream is toward the rear. He is right, even though the cost goes up, replace all four of them

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