What size is the o2 sensors on the 97-04 f150s? I want to change mine tomorrow but not sure if it have the socket or wrench for it.

 

It helps if you go to AutoZone or some store like that and rent the O2 sensor sockets...they have a slot in the side so the socket slides over the cables.

But in any case, I believe its a 7/8" or 13/16"...I forget which one.

 

It's 7/8".

 

+1.

 

The nut on the O2 Sensor is a 22mm.

JMC

 

i found the easiest way when changing mine was a 22mm stubby.

 

7/8 = .875 in = 22.2 mm, 22 mm may be the right size but 7/8 has worked fine for me in the past

 

Nine times out of ten a standard size wrench/socket will fit on a metric bolt and vice versa. It is that 10th time that gets you. I must confess that I have been in situations that have seen me use a standard tool on a metric fastener but I leave that up to the individual to decide. That is why I strive to provide the most accurate information that I can.

JMC

 

make life easy

remove the inner fender wells- about 6 screws and 5 minutes

disconnect the wire harness

use a 22mm or 7/8 box

no need for a special tool plus disconnecting the harness becomes much easier

 

I just used a regular sized 7/8 inch wrench. It was easy. The only thing I removed was the transmission dipstick tube. 1 bolt.

 

For future, I got an O2 sensor flex head wrench, that is like a 2 sided open end 22mm wrench.



Worked great, but now that I read the remove the inner fender wall trick, I might not need it any more.

 

fender well trick works for the starter too

 

Not if you have headers.

JMC

 

The hard part for me was getting the plastic clip loose. The sensors were easy to unscrew with a regular wrench.

 

somedays life ain't fair

engineering is said to be a science of compromises
go fast- give up mileage/get good mileage -go slow
have headers and go fast(maybe)/ starter removal goes slow