[p_mcnaught]

We have a total of 4 correct? 2 Before the Cats and 2 After. Are all 4 the same. Because I was looking up some replacement sensors and the part number was the same for all 4!

 

[Hit Man X]

I could have sworn some rears have different plugs.

 

[kawamatt2]

For my obs the autoparts guy had different numbers for "upstream" and "downstream." Not sure about nbs.

 

[Bradford]

Ive been told upstream and down stream are different. I know they cost different one is like $50 and the other is over $100. I need a down stream one and thats the $100. Any one know the factory part number so i can look it up on gmpartsdirect?

 

[Covah]

I do believe they are heated sensors, hence a price difference.

 

[GMforLife]

I believe the rears are the heated ones because when you go long tubes and the heater sensor light comes up you turn the rears off to fix the code, they just monitor the cats and nothing to do with the tuning. So i would believe they are different

 

[86mcss]

The fronts O2s are different because they have the heaters and the rears do not. The plugs on the front and rear O2s were the same on my truck.

I know the front are heated and the rears are not because when I did the LTs on my truck I did not use the rear O2s and put them in my tool box for safe keeping. A month or two later my O2s went out and I used my rear O2s in the front. I got an engine code that the O2s were not heating. They O2s worked but just had no heaters.

So the front have heaters and the rears do not.

 

[p_mcnaught]

The fronts O2s are different because they have the heaters and the rears do not. The plugs on the front and rear O2s were the same on my truck.

I know the front are heated and the rears are not because when I did the LTs on my truck I did not use the rear O2s and put them in my tool box for safe keeping. A month or two later my O2s went out and I used my rear O2s in the front. I got an engine code that the O2s were not heating. They O2s worked but just had no heaters.

So the front have heaters and the rears do not.

You avator is disturbing!

 

[86mcss]

You avator is disturbing!

...but you cant turn away :whip:

 

[xlcooplx]

03+ trucks' 02 sensors are the same. 99-02, the plugs are different.