stainless
New member
I have a cel that is reading p0420 when i reset it my engine starts to run at low rpms at idle 750 or almost stall. I have replace the orange upstreem 02 sensor but i still get the code. About 90k 06 foz x . Should i swap out the rear/ downstream? Both are a bugger to remove and i still have most of the front off at this point. ![image.jpg image.jpg](https://www.mainelysubarus.com/data/attachments/2/2958-a67202d439c69fca528173827768281b.jpg)
![image.jpg image.jpg](https://www.mainelysubarus.com/data/attachments/2/2957-d511f17e47ca37084b7ba2aa71e65c6b.jpg)
![image.jpg image.jpg](https://www.mainelysubarus.com/data/attachments/2/2959-e6f3b32ba67d0ee32eea66f4861aa25a.jpg)
![image.jpg image.jpg](https://www.mainelysubarus.com/data/attachments/2/2958-a67202d439c69fca528173827768281b.jpg)
![image.jpg image.jpg](https://www.mainelysubarus.com/data/attachments/2/2957-d511f17e47ca37084b7ba2aa71e65c6b.jpg)
![image.jpg image.jpg](https://www.mainelysubarus.com/data/attachments/2/2959-e6f3b32ba67d0ee32eea66f4861aa25a.jpg)