Whether you have a OBDII trouble code, or your Toyota Sienna oxygen sensor (02) is beginning to fail, knowing how to change your Toyota Sienna oxygen sensor can save you a lot of money. The oxygen sensor is responsible for monitoring the mixture of air/fuel in your exhaust stream. Using this information sent by the 02 sensor, the Toyota ECU can adjust your fuel injector pulsewidth and deliver more or less fuel as your Sienna needs it.
Today we’ll be showing you how to replace the front oxygen sensor in a 2013 3.5 L 2GR-FE V6 Toyota Sienna LE. The Toyota part number for this 02 sensor is 89467-41040, and the problem of the Toyota Sienna oxygen sensor failing is common. Usually this can be seen through the dashboard as your Toyota Sienna will trigger both the Check Engine Light as well as the VSC light.
When using a scan tool to retrieve your Toyota OBDII codes, codes like P0135 for Oxygen O2 Sensor Heater Circuit Malfunction, or something similar may be stored. Using our handy DIY guide, you can learn how to change your Toyota Sienna oxygen sensor the quick and easy way.
Symptoms of a failed Toyota Sienna oxygen sensor include :
- Poor gas mileage
- Sluggish performance
- Check Engine Light is On
- VSC light is ON
We’ll be replacing the front oxygen sensor in this Toyota Sienna, and needless to say you’ll want to do this when your Sienna engine is cold. In order to reach your oxygen sensor harness and unplug it, it’s best to remove the air induction tube in front of your engine bay.
Remove these two 10mm bolts and then loosen the worm clamp that leads into the throttle body. Once you have these bolts and the worm clamp loose, push the entire intake upwards to remove. You might not have to remove this intake pipe for our how to change your Toyota Sienna oxygen sensor guide, but it definitely helps.
Once this intake pipe is out of the way, you’ll have an easier time accessing the front oxygen sensor harness. This harness and wiring is secured to the top of the upper radiator hose and must be cut away for the oxygen sensor to be removed.
Reach down and unplug the oxygen sensor wiring harness by depressing the release clip. Pull the two halves apart and you can now cut the zip ties that hold the 02 sensor wiring to the coolant hose.
Now remove the front oxygen sensor with a 02 socket or a 24mm open wrench. Once you have this front oxygen sensor removed, you can install your new unit. The Toyota part number for this 02 sensor is 89467-41040 and it can often be confused with the air/fuel ratio sensor.
If you are looking for the emissions oxygen sensor, this is not it. This is the upstream primary EFI oxygen sensor that your ECU uses to maintain closed loop operation. The downstream version of this part has several aftermarket offerings with a few different interchange part numbers, listed below :
89465-08060
89465-08100
89465-08110
Apply a thin layer of anti seize to the threads of the primary oxygen sensor, making sure not to make contact with the tip of the sensor. Screw into your front header gently and make sure not to cross thread the 02 sensor.
Use a scan tool to clear your OBDII trouble codes, and you should be good to go. Have any questions about our how to change your Toyota Sienna oxygen sensor guide? Leave them for us below!
I had a code of p0031 so I replace both banks with sensors from prime choice after I installed them the code went off and then I got 3 other codes p0051, p2238, p2241 I don’t know what to do next could you please give some advise what to do I would really be great full thank you
Manuel Escobar
Hi Manuel, thanks for reading. Okay you have now changed the coils completely, and your P0031 went away but now you have :
p0051 – 02 Heater Control
p2238 – 02 short
p2241 – O2 Sensor Positive Current Control Circuit Low Bank 2 Sensor 1
Couple of quick questions.
1. Did you try clearing the codes again?
2. Do these 02 sensor codes return immediately? If no, go to 5
3. If these codes come back right away, do they come in even after you have cleared your Sienna DTC and you don’t turn the engine on? In other words, try clearing your Sienna ECU and then don’t turn on the engine, just turn the vehicle to the “ON” position.
4. Did you disconnect your 02 sensors?
5. Try replacing your 02 sensor if these codes are returning when your engine is on.
Let us know Manuel how this turns out, we’ll be glad to continue to help! Thanks for commenting!
i have an 06 sienna that had misfire codes P0300, P0301,…P0306. I had all plugs and coils replaced.
still getting misfire codes. most recent P0303 and P0306. Could a bad o2 sensor cause the system to set misfire codes?
Hi Hunter, more than likely the 02 is not the problem. Have your checked your fuel filter? What about your MAF? Does the engine run rough? or is it just the engine codes?