Replacing air fuel sensor Denso 934-9001

Any tips or suggestions on the fix? Difficulty? Time? Special Tools?

My truck is an 02 Tacoma Pre-Runner 3.4LV6. I'd like to tackle this problem myself to save money.

Any help would be greatly appreciated.

Thanks

 

Is that the one behind the cat air fuel racial or something like that??? If so it a breeze. .. it connected to the inside of the cab on the driver side. Rockauto.com has the best price that I was able to find

 

WWJD??? ^^^^

 

I think it's the one before the CAT. Pretty simple. Just need a wrench/socket (10mm or 12mm cant remember), a flathead screwdriver, and maybe a jack. I know on the prerunner, you can just slide underneath the truck and its on the passenger side. Idk if the SR5s are the same.

 

Ok sounds like it's behind the 2nd cat like I thought....yea it's a 10 or 12 mm it plugs in under the mat close to the driver side door

 

What code is being thrown that you decided that it needed replaced?

With the truck running, check for exhaust leaks (you can normally hear them, then pinpoint where they're at.) A leak will throw the same code as a bad sensor.


To replace the front/upstream sensor, it helps to take the center console out (no big deal, like 6 screws) so you're looking through the floor at your transmission to unclip the connector.

For the rear/downstream sensor, the connector is under the passenger seat...remove the 4 screws in the door sill and there will be a cable stuffed under there that runs to the rear sensor.


When you get the code, post it up here so we know which sensor it is (rear and front will throw two different codes)

 

9001 is the Air/Fuel sensor (upstream) so its before the front cat. Still a simple job just make sure the truck has been sitting for a while. I think you need a 10mm socket and maybe a screwdriver to help unplug the connector. I used gasket seal but the denso should come with a newer type of gasket that doesn't require sealant. The rear downstream O2 sensor is also simple but the connector is under the front passenger seat so you gotta remove some interior pieces

 

Its a pretty easy job on the auto because the plug is easy to get to. In fact, figuring how to get the plug apart was the biggest challenge.

A 15-20 minute job all total if the exhaust pipe is cold. I also disconnected one terminal off the battery which clears the code and the ECU will have a fresh start with the new sensor.

 

Thanks for all the help. It was the one in front of the cat and it took me less than 30 minutes.

Love working on my truck.

Take care all!