So, my wife's 2010 RX350 AWD started have problems shifting into reverse. Transmission functioned properly till the issues. I pulled the codes with my Bluedriver and got- P0791, Intermediate Shaft Sensor.
I know the sensor is on top of the transmission and you need to remove the airbox to get to it. The Haynes manual I bought does not cover my particular model on how to replace the sensor. Can someone walk me through
the process? I have searched the internet and this forum and came up with nothing.

 

How many miles are on it and have you ever changed the transmission fluid? Your transmission may just be failing and need replacement.
It is called the U660E transmission made by Aisin-Warner, which is mostly owned by Toyota
This may help

Try searching here as the 2008-13 Highlander is a mechanical twin, as is the 3rd generation Sienna.
https://www.toyotanation.com/forums/...2008-2013.122/

Try reading these articles
https://www.transmissiondigest.com/t...est-locations/

https://gearsmagazine.com/magazine/t...transmissions/

​​​​​​https://go4trans.com/transmission/u660e/

 

Thanks. I spoke with a Lexus tech and he said most the time when this code is displayed it's rodent damage or corrosion at the sensor. The sensor sits on the self on top of the transmission and rodents like to hop up there. The transmission has never shifted rough or shown any signs of slippage leading up to the issues. Her RX only has 110k miles on it and it's been very well taken care of.

 

We have only had the car a few months. Previous owners took really good care of it but I'm not sure if they ever changed the ATF. I know it's supposed to be a lifetime ATF but we all know that's not the case.

 

These Aisin transmissions are mediocre at best. Changing the ATF at least every 50,000 miles with fluid that meets the proper specs is the best long-lifespan insurance you can provide (along with not driving these things like boytoy racers).

 

You can join the Toyota Technical Information System for a day and look up what you need to access that sensor
https://techinfo.toyota.com/techInfo...a.com%3A443%2F

You can also go to the Lexus Drivers Site, join for free and by entering your VIN learn about the dealer service history for your vehicle. https://drivers.lexus.com/lexusdrivers

 

Any update with this one?