Hello Roverers,

O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 2) code appeared... would swapping it with its counterpart (B1/S2) be a good way to test if it actually works? or even with (B2/S1)?

I use Torque Lite and the needle for that sensor does not oscillate, it is stuck between 0.4 & 0.5; other three do oscillate pretty much.

If needing to replace it, can I just change the faulty one (B2/S2)? or should I replace them in pairs (both rear or both passenger side, or do I need to replace all four?

Also, I know our truck does not give us great mileage, but I'm down to approximately the low 11's mpg, when I was at about the mid 13's to mid 14's in December. But lately has been dipping rapidly.

I stopped commuting to work using the highway after I moved (if I do, I'll add approximately 10 miles to my daily commute), now my commute is shorter, but through city traffic; I'm sure it accounts much for the dip in mileage, since I used to get 300+ miles from a full tank of gas in a week, now I'm down to nearly 250 miles, and the number keeps dipping.

I may have some other issues affecting gas consumption, but seeing this O2 not oscillating after the code popped up, I'm sure is part of the issue. I also have P1171 & P1174 on display.

Any pointers will be appreciated. ;-]#

 

 

I just replaced both of my daughter's rear O2 sensors (bank 2). Everything was easy to do EXCEPT the electronic connection on the passenger side which required me to reach around and above the front drive shaft to disconnect the old and reconnect the new O2.

If you have long fingers or skinny arms, you'll have an easier time than me.

 

You can replace just the problem one. For the replacement, order a Walker sensor off Amazon. They seem to be the most reliable out of the box, with far fewer dead ones being reported than the Bosch ones.

 

X2 on the Walker sensors!

 

 

Thanks for the prompt input guys, will proceed with the swap first to test, and take it from there... ;-]#

 

...went under my truck to try swapping the B2 sensors with no luck, I just couldn't reach comfortably enough to get a nice grip and unplug it ...damn, talk about being between a rock and a hard place. I'll lift my truck tomorrow and see if I can get a better reach.

I went for a 20 mile errand-run after the attempt and symptoms are the same, so thankfully me jingling the wires did not complicate things. See pic of Torque Lite readings.

 

...here is an update!

...after going under my truck to attempt swapping left & right downstream O2 sensors, and failing to comfortably reach the passenger's side plug to release it, I decided to wait for new sensors and tool before giving it a second try.

Parts arrived and decided to drive two passenger's side wheels over curb, so truck be high enough for "a 260 lb - 44" waist man" to crawl underneath and comfortably reach the plug.

This second time around it worked; I was able to reach the plug with my two hands -although with a bit of difficulty, but definitely much comfortably. Once plug was release it was pretty easy to unscrew the sensor with the tool, thankfully I ordered a Pro-Tool socket with a handle, which was very helpful. Sensor gave up after giving a bit of a fight, and putting up the new one was fairly easy.

I did get a second sensor to replace driver's side, despite it seems to be working fine, but I believe it is recommended to replace them in pairs; and although this side's is much easier to access and replace, I was not able to make it turn after I few tries; besides, it was too hot out and since it was working, I decided to crawl out and confirm the first one solved my prob; so fire-up the tuck, gave it a few runs around the block, and indeed it solved the initial prob, so I'm happy so far. I cleared the faults, but will see after this week's commute. See pic of removed sensor attached.

I will attempt to change the driver's side later today; I will have to use and extension to get a bit more leverage and torque with the Pro-Toll socket, or maybe douse it with some PB Blaster; hopefully, I will be able to get it out and replace it with the new one, but think to keep the old one as an emergency replacement.

Will keep you guys posted with final outcome.

 

I always highly recommend getting your adaptive settings reset whenever you replace a MAF, or O2 sensors. Sets it to default settings & then it adapts to the new readings vs having the old settings and trying to make the new stuff run to that vs it’s new settings it learns from the new parts.