Eliminate the guessing game for me when I go to buy one tomorrow :P

All my wrenches are too small.

Metric and Imperial if possible.

Thanks.

 

As far as I know all O2 sensors are 7/8 or 22mm. They make a special socket with a slit in the side of it for the wires if you'd rather have that.

 

Big Crescent.

 

Pipe wrench.

 

How about vice grips? lol

 

7/8 wrench will do the job, did my downstrem o2 last week

 

you notice a performance diffrence if theres over 100k on them ?

 

I saw no change on mine with 125,000+-2000.

 

I changed mine at about 70k. No noticeable difference.

However, my wife was having an intermittent misfire on cylinder 4 on her Durango. Changed the coil, changed the plug (again), no change. Figured I'd have to change the injector.

Since it has 85k, I had the front O2 sensors replaced while it was in for something else. The misfire went away.

If you do change it, use one of the sockets designed for an O2 sensor. Much easier. Also, get a Denso or NGK sensor from Rock Auto. Much cheaper than auto parts places, and you avoid the junk that way (Bosch sensors).

 

Might be a mpg gain.

Older sensors tend to take a bit longer to swing back over the center, or lambda. Slower swings waste gas.