Hello
I have an 07 fit sport with 160k miles and I just threw a P0135 code from looking it up my guess is that my o2 sensor needs to be replaced I was reading that we have possibly 2 so I'm wondering which one I need to replace? Also if anyone knows the correct part number to maybe find a good online price or if someone already knows of a good place to get it if you could point me in the right direction that would be great. Any tips or lessons learned from someone who has done this before?

Thanks for any help!