may be in the wrong section here,but need to know alittle info on changing them.where are they located and are ther any tips you can give.Truck is 02 supercrew fx4.

 

Look just downstream behind the exhaust manifold. The bolted in O2 sensor is located upstream in front of the catalytic converter. Unbolt and disconnect O2 wires about a foot up. Then replace.

Norm

 

Upstreams are not fun....I would have a mechanic do them if I could do it over...

 

What he said. I had a muffler shop do mine ..... they deal with them all of the time anyway.... $ 40 labor.

 

Piece of cake on the F-250's.

Note: If you change them yourself, unplug them first, then loosen and unscrew.

 

so ther will be 2 sensors on my truck?

 

Easy, just take a look.

Norm

 

You should find 4 O2 sensors.

One sensor on each side between the exhaust manifold and the first converter, and one sensor after the first converter on each side.

I just changed my 'upstream' O2 sensors. It was challenging, but not impossible. Perform a seach for some detailed instructions if you wish to do it yourself.

I used a 7/8 box end wrench and cut part of the connector off so I could slide the wrench over the O2 wire.

The passenger side is the most challenging!

 

The 1997 & Up F-150 uses 4 )2 sensors, only 2 of which we are concerned with - and those are the "upstream," or "front" O2 sensors - that means the O2 sensor on each side of the engine that is in the exhaust BEFORE the exhaust reaches the first catalytic converter.

It requires a special O2 sensors socket to do it right, and I recommend using some penetrant on there and letting them sit for a little while after spraying the penetrant before attempting to remove, as they can tend to be quite stubborn.