Upstream O2 sensor part number?

I’m trying to find the correct part number for a denso or Toyota upstream air/fuel sensor. The dealership couldn’t find the correct number for the sensor and the densor website doesn’t show a sensor remotely resembling the one I pulled out. The one I pulled out does not have any markings that are legible. I have no idea if the old owner swapped in a cheap brand sensor or if the one I just pulled is correct and just not available anymore or if another part will work in it’s place? I have a California car if that makes a difference.

 

RockAuto says the same sensor fits the Upstream and Downstream

 

Rockauto is wrong. I’m not an expert but some used the same o2 sensor front and back and some used an air/fuel sensor front and o2 sensor back. Mine is the latter and the dealership does not have a part number of the correct air/fuel sensor or any idea if swapping the o2 sensor for the air/fuel sensor will work or if it would require a new ecu also and if that is California compliant.

 

Is your truck a Cali compliant truck?

 

Best I can do is provide this link.
https://partsouq.com/en/catalog/genuine/pick?c=Toyota&model=TACOMA&ssd=$*KwESSE8rEhkeAAAAAIH0LWA=$

 

Mebbe check McGeorge or partznet dot com for reference/compatibility?

Let us know-

 

https://www.densoautoparts.com/

 

Update-The dealers said I needed a part that they cant get and denso website said the part doesnt exist and I read most trucks use the same 02 sensors front and back so that's what I tried. I just put a 2nd o2 sensor in and figured worst case is I needed a different ecu from the junkyard to make everything play nice for CA smog and check engine lights. It has been over a week and it works perfect with the same denso o2 sensor front and back despite the dealer saying otherwise via my vin number.

 

Glad it worked in your case.

I know my 2000 3.4 takes the Air Fuel sensor for my California Emissions engine.

I just replaced it.