Been replacing anything factory as can afford and now working the O sensors. I have ordered 3 separate sets of sensors - Denso, Delphi and Walker, and all the wiring harness coupling do not match what I have on my 2007. Could this be something where I have a multi-year truck? Maybe a 2006 need for oxygen sensors? I was shocked when the Delphi ES20364 did not fit today.

The Denso's were 234-4265 and 4266 and didn't fit... Looks like the 234-4264 are correct...

Any advise?

 

I found this here on the forum some place and copied it for myself. I have a 2006. Not sure if this will help you though.


O2 sensors
There are 4 different sensors for the LR3, MHK500840 for each of the front ones and MHK500910 Rear left hand and MHK500960 Rear right hand, all of these have different plugs so you can't fit the in the wrong position. But there is one other, pt No. MHK501050 that is just listed as a rear O2 sensor for 07 - 09, but it has a different plug again.

For 2006
2 of Denso 234-9075 Oxygen Sensor (Air and Fuel Ratio Sensor) upstream
Denso 234-4265 Oxygen Sensor (Air and Fuel Ratio Sensor) Downstream right
Denso 234-4266 Oxygen Sensor (Air and Fuel Ratio Sensor) Downstream left

 

I think 2007 is where there were some changes to the O2 sensors. Here is the link to the Denso parts website:


Find My Part


For a 2007 LR3, it says you need 234-9075 for both upstream left and right and 234-4264 for both downstream left and right.