oxygen sensor best price

would like to know where can i find an oxygen sensor at a good price upstream

 

Oreillys sells Denso AFR sensors for a decent price.

 

Definitely not fleabay or the book store

 

OK I'm going out on a limb here, welcome to my "dark side" LOL

In 2018 I replaced both O2 sensors with aftermarket versions from RockAuto. This is a Cali truck with Cali cats. Passed CA smog both times. Passed smog here in Idaho in 2020 (or was it '21), but it's nowhere near as strict. I do recall the guy saying it's way above legal with room to spare. It's now 2024, no codes, no issues. Make of it what you like.

I'd suggest replacing them both if one is bad, the other's not far behind.

 

I tend to get the Denso or NGK sensors if possible. They are usually cheap if you get the generic version of the sensor from one of those companies, and splice the wiring harness from the OEM one onto it. If it is a pain in the arse to get to the sensor or pull the wires for it, i'll just bite the bullet and get the purpose made sensor for the vehicle. Denso or NGK. Bosch should also be o.k.

Nobody seems to beat rock auto's prices. a little less convenient than popping in to your local auto parts store, but I'm rarely in a hurry, so don't mind waiting a few days or a week for parts most of the time.