I am not getting any codes but at 152,400 miles I think its due for a changeout. I am also hoping it would get rid of my misfire, but thats really just grasping at straws at this point. I know of one placed near the oil filter but I haven't seen the others.

 

The o2(s) that are right off the exhaust manifolds are the ones that affect mpg. There's only 1 for the I4 and two for each e-manifold for the V6.

 

I have the V6, where on the manifold is the other one because I noticed autozone lists them as right and left.

 

The other one is on the other manifold closest to the firewall and in the same spot as the one up front bro.

 

ok.... i have had a check engine light on in the past that dealt with the o2 sensor but still havent managed to have it fixed.... but anyways the other day i noticed the check engine light went OFF... and stayed off for about a week. and then just today i noticed it back on and i did the key dance again and it read the same code (2,1) which is the o2 sensor, BUT IT READ THE CODE TWICE..... so does this mean both of my o2 sensors are bad?????
I've got the V6

 

the first one was never cleared ...you might only have one sensor bad ... the light turned off since you have been running with it so long or the faultfixed itself temporarily then it came back or reoccurred

 

there is 2 on the 2.0, one right past the manifold, and one under the car, right past the cat