Dash cluster did a fun light show. Have a long drive ahead of me this tomorrow so brought it to the stealership by work. The codes that hit were Air Fuel Ratio Sensor and o2 Sensor. They quoted me at about $1200 which was comical. Found what I believe to be each part on amazon from Denso for about $200 total (model #234-4261 is o2 sensor and 234-9051 is AFR sensor).

I have found a few different guides for 3rd gens or different located sensors on 4th gens but was hoping for a little help here. Does any one have any experience with these jobs or have any guides on hand? Is there anything else I might need in the way of parts? I know this isnt an imperative fix but I would like to do it myself and get it done right.

07 V8 SE

I don't have any experience with the V8, but on the V6 there is an AFR and O2 sensor on each side so 4 sensors total. The AFR sensors are harder to get to since they are against the firewall.

Just go out to your truck and look for them. Look in the engine bay and follow the exhaust manifolds down until you see the AFR. Then get under the truck and lookfor the O2 sensors on the exhaust. They should all be visible.

This is an easy job. Buy the correct OEM/Denso sensors and an O2 wrench.

Two are behind the fender liners on each side. My Runner is lifted and I could change them by just reaching above the tire. Other two are easily found under the truck. Might want to hit them with penetrating fluid for a few days before attempting removal. I didn't have any issues getting mine out. Use the supplied anti-sieze!

I changed both on the driver's side a year ago. As said, the rear O2 sensor is accessible from under the truck. Might want to drive it up on ramps for easier access.

Best way to get to the front AFR sensor is through the wheel well. Put the front of the truck on secure jack stands and remove the wheel; that will make the job a lot easier. An O2 sensor wrench helps - I used a crow's foot wrench that also worked well.

The hardest part on the front sensor for me was figuring out how to activate the connector release. It's hard to see the tab you need to press, and to get your hand in there in such a way so as to apply adequate force.

I did not have to use penetrating oil and had no trouble breaking them loose, but my truck has essentially no rust underneath.

Is there a way to verify the correct Denso part number for these codes? I have been researching for days and I can't seem to find a straight answer.

I ordered Denso 234-9051, 234-4261, and an o2 socket off amazon. I am now having my doubts about the correct part number.

Go on a online Toyota parts store that uses your VIN to search for the proper part #s. I usually use Conicelli Toyota Conicelli Toyota of Conshohock | Genuine OEM Toyota Parts