Hi, This is an upstream oxygen sensor. To check the fitment please use our Vehicle Selector — which can be found towards the top of the homepage as well as all categories, search results, and product pages — can help verify if a part will fit your specific application. To enter your application, simply select your vehicle’s year, make, model, sub-model, and engine type and click “Go.” Once your application is selected, you’ll see a “Guaranteed to Fit” badge if the part will fit, and we recommend that you also double-check Your Vehicle Fit Details as well as the Vehicle Fitment Information table on the product page.

Hi Roger, I'm glad to assist you. Yes, it will. Click on the link below for direct ordering to take advantage of our ongoing discount and limited stocks. I hope this helps, and happy shopping. https://www.carparts.com/oxygen-sensor/drivewire/set-rept960907-2?can=CPAE1047_CSQA_20230201

Hi Jon, Yes, this is compatible with the V6 2001 Toyota 4Runner models.

For a little while Then a/f sensor code will come up again You need a denso brand

I’m not really sure because my truck was a 4 cylinder and 2003.

Hi Lisa, I'm pleased to assist you. Yes, these sensors are guaranteed to fit the California-ESV of the 2002 Toyota 4Runner SR5 6 Cyl 3.4L. Click the link below to continue ordering at a discounted offer today, while supplies last. I hope this helps. Enjoy your CP shopping experience! https://www.carparts.com/oxygen-sensor/drivewire/set-rept960907-2?can=CPGG4850_CSQA_20230407

2001 4 runner limited

Hi, This is a set of 2 oxygen sensors upstream location for the bank 1 and 2 of a 6 cylinder engine. Also, for left and right bank front location only(upstream).