How many do we have?

Im guessing one before each cat, and one after each cat; so a total of 4. Is this correct or are there more downstream by the y-pipe or up by the manifolds?

Also, to remove them do all I need is a regular wrench and turn them counter-clockwise?

Thanks guys.

 

Alright, Im getting confused on what part numbers I need for different O2 sensors on the sites. If I only need 4, it looks like 3 are the same and 1 is different.

From Rockauto.com

Upstream Right and Left, Downstream Right - Bosch #13937
Downstream Left - Bosch #13775

Can anyone confirm that one would be different?

 

Oreilly's lists these for Bosch:
#13775 - downstream left
#15733 - downstream right
#13937 - upstream, 2 per vehicle

Why are you replacing all 4?

 

Because Im at 112k and they havent been replaced yet. The recommended replacement is at 100k so I figured for $150 its not the worst thing to replace.

.... and Im trying to see if it helps my rough idle. Eimer said my truck idles noticably rougher than his. I do like it rough, but Id prefer my idle to be smooth. Lol

 

Alright, Advanced is showing the same thing that Im finding on Rockauto; 3 are the same, 1 is different. But Oreillys is giving a whole different part number for the right downstream.

Update: Autozone is showing 15733 as a universal O2 sensor

I went ahead and bit the bullet. I ordered 4 O2s from Rockauto for $148.95 shipped. I hope to see some better performance with the new ones .... but I wont keep my hopes up too high. From what Ive read, replacing old O2 sensors is a good idea to avoid future problems caused by fading O2s that arent triggering an engine light yet. Now hopefully I can replace them all myself ....

 

Be aware that even an applicable Bosch sensor may cause issues. I replaced my Bank 1 pre-cat sensor @ 80K with a Bosch unit and had nothing but CEL codes every other day. Put the original sensor back in with 80K on it, and it hasn't thrown a code in 9K.

 

Did you every figure out why the bosch caused problems? I thought they were a pretty reputable company ....

 

And while Im thinking about it;

Is the following correct?

Bank 1 = Left side = Drivers side
Bank 2 = Right side = Passangers side

 

if your sitting in the drivers seat...lol....I always double check because you never know....I ordered a "right side" marker light for my sons ZX2 and i asked if that was drivers or passengers, in that case, their "right side" was drivers, i.e. looking at the front of the car.

 

yeah right bank is drivers side left bank is passenger side! its looking at it from the front of the vehicle!