I have a 2004 5.4L with 123000 miles.

I occasionally connect my reader to the computer to see how it is doing and if it is popping any codes. The last time, I noticed that the B1S2 and B2S2 oxygen sensors were not changing their readings and the O2 light on the main screen of my reader was blinking.

I know that this means that I need to replace those O2 sensors, but I can't find anything that tells me which is sensors these are. Google searches come up with very widely different answers.

So which is Bank 1 and Bank 2?
And
Which is Sensor 1 and Sensor 2 on those banks?

Any help would be great.
Thanks,
Gary

 

Bank one sensors are the front o2s, bank 2 are the rear ones. Sensor 1 is the passenger side and sensor 2 is the drivers side.

 

Sorry, I just double checked and this is wrong. Bank 1 is the pass side and bank 2 is drivers. Sensor 1 refers to fronts and sensor 2 refers to the rears.

 

To be a little more clear: on any vehicle, bank 1 is always the same side as cylinder #1, (so bank 2 is obviously the other side). And yes, sensor 1 is always before the cat, while sensor 2 is always after the cat.

Also, because sensor 2 is after the cat, the changes in readings should be very minimal if the cat and sensor 1 are working properly. So if you don't have a CEL, and you are just assuming they are bad because of the readings, I would guess that they are working as designed.

 

Hey guys, looking for some detailed info on getting to bank 1 sensor "passenger side" all i can find is info on a 2003, 04 is the new body stile and i'm thinking it'll be different. can SOMEBODY help with this.

 

What are you trying to do?

 

To replace the sensor(actually an update) I did tackle the job, it was not simple or easy by any means. I was looking for an easier way to replace it but there wasn't one. The sensor is in & the "MIL" is out and all is grand @ 181,060 miles. I think that is remarkable & now that the hard one is done I'll be replacing the other 3 soon.

 

I did all 3 yesterday but this one. I ruined a shirt cause I bled on it and my pants. Brutal. That one I'm not looking forward to at all LOL. I have to look again and see if I can move something. They hid the connectors so only Houdini can get to it.

 

Well what i did on the passenger side is i removed the inner fender well and of course the neg side of the battery, then took lose the trans dip stick I DIDN'T take the dip stick out wasn't able to thank God i didn't! But did pull it out of the trans,and i was then able to turn the o2 socket wrench with all of my extensions and a breaker ratchet with brut force, oh by the way you want to watch where you have your hands when the sensor breaks lose because i smacked the caliper and my finger still hurts! There is little to no space to work even with the trans tube lose. Glade i have that one done, the other 3 don't look to hateful. HA! Oh i 4got to say you are going to need an o2 sensor socket.

 

You need one of these:

 

Sounds like what I experienced haha. Ill just wait a bit, can't risk tying the truck up just yet

 

I actually have one already. The harbor freight one worked great. Got some swivel extensions as well.

 

myford f150 is acting like it is missing on 2 cylinders,changed wires and was fine for 2 hours now back and forth now code says sensor 1 bank 2 will that maake my truck run like this?

 

Post the exact numerical code. Also, why are you posting in someone else's thread in the 2004-2008 truck section when you have a 1997?

 

Thanks for the info. The guy at the auto parts store didn't give me right info. I was lucky. The code was bank 1 sensor 2. I went right to it and it was actually loose. Cleaned it up and everything is good now.
Thanks again,
Brad