2009 RWD

You can see my previous posts if you want the full story, but the short is I had a P2238 and P0171 code that would come on sooner and sooner each time I reset it. First it took a few months between codes, then it go to where it threw all the time.

Finally got them fixed. Shop replaced both bank 1 sensor 1 and bank 2 sensor 1 (both front sensors). Cost me $700. Told they used denso.

Got the car back after some other unrelated issues were resolved and I got a p0038. Great, Low heater voltage. So it seems bank 1 sensor 2 needs replacing. Ordered both rear sensors. I figured out how to do it and worked my way through today doing the driver side that is throwing the code. Rented the o2 socket tool and replaced it. Battery was unplugged while replacing. To test it out I turned the car on. Code is gone!

New code hits! P0031. What? That’s the same heater voltage issue but for the top sensor I just had replaced. All previous codes are still gone.

Do I have a bad new sensor or is it something else? Like I said the old codes are going away with each repair, but I keep having new codes show up that are still O2 sensor related. I did not replace the passenger side yet because I didn’t want to keep replacing things until I knew for sure what was actually causing codes. I was also very tired and frustrated because it was a bigger job than expected. Two biggest problems were getting the actual sensor loose and getting the stupid gas pedal detached to roll the carpet back.

 

Did you test the sensors before replacing them?

 

Please tell us if the shop you use advertises themselves as Japanese car experts. Many shops will attempt to do repairs but unless they have specific experience and the proper software for Lexus, things like this happen. Ls460 is not just a car, it's complex and specialized. I hope you get this resolved.