Quote:
Originally Posted by Rock_Rat
You can take a look at my build thread for the exhaust if you want. It's here. My Exhaust system
My TRD headers came with a bung for the A/F sensor. I'm using it for the AEM gauge. The photo you have is correct. That should be your A/F sensor.
I also have an additional bung that came with my upstream cat which I'll use for my A/F sensor. I chose to keep both of my Cats.
(EDIT: If I wasn't running an AEM A/F gauge for the SC I would only have an upstream and a downstream bung.)
The third bung, or in your case the second bung which you should have but since you went with a straight pipe I don't believe it's on there would be the sensor reporting the condition of your CAT to your computer. This is your O2 sensor on the DOWNSTREAM side of your Cat.
If you don't have it you will constantly get a 0420 code. The way some folks get around it is to "ignore" it or take the CEL bulb out. The other way to get around it for DEQ is to have the additional bung welded in the pipe by any muffler shop and install the URD option. |
I took a look at your exhaust setup and it looks really good! It also cleared up a lot of things. So yes the cat that I deleted is the upstream cat. I left the downstream alone alone and the O2 sensor which is past the downstream cat alone as well.
The bung that I have on my headers is for the A/F sensor. I may get a bung welded into the pipe replacing the upstream cat for a wideband sensor, but thats later on.
I believe my cat is fine, and I may eventually replace it with a high flow cat, but I do believe that my only option for clearing the code for good is getting that URD attachment.
Thanks for all the help!
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2002 Toyota 4Runner SR5 2WD- 35" Duratracs, 3" SL, 2" BL, OBX Stainless Steel Headers, 95% Limited interior conversion
BUILD THREAD-
http://www.toyota-4runner.org/3rd-ge...ld-thread.html
