Hi N.E.O.

It's a quick procedure. Just a bit more complicated than changing spark plugs or oil & filter.

Everyone works at a different pace, but I would say 1-2 hours, as long as you have the necessary tools, e.g., I used a crowfoot wrench socket for bank 1, sensor 1 (the left side of the engine if you are sitting in the driver's seat) because my standard O2 socket didn't fit there. Maybe less than one hour if you are really focused; maybe two if you have a brewski in one hand ;-)

How long did it take you to replace both sensors?

You are welcome, dscabicky. Glad to be of help.

I'm going to assume you are referring to "Bank 1, Sensor 1 Left-bank Pre-catalytic Oxygen (O2) Sensor" and/or "Bank 2, Sensor 1 Left-Bank Pre-catalytic Oxygen (O2) Sensor". In these pictures, yes, you are looking at the underside of the vehicle as shown in the diagram.

As I wrote in my article, I did not have to jack up my vehicle. Plenty of space underneath the car to get the job done.

-Clifford Vincent Arrow

Thanks, Clifford. Am I looking at the underside of the vehicle in your photo. Do I need to jack up the LC to replace Bank 2, Sensor 1?

-dscabicky

Nicely improvised!

Thanks for the response Clifford, I agree with you about the OBD2 reader and will be picking one of from somewhere soon. In the mean time I found that by disconnecting the battery for a couple of minutes that the check engine light has now gone off. I did have to reprogram the seats and radio stations but not a big deal. Again thanks for all the help you gave me on this project it really was pretty easy to do and did not take too long. Gary

You are welcome. I’m glad to hear my article helped you out.

I’d suggest you get a cheap OBD2 reader that has the ability to read Diagnostic Trouble Codes (DTCs) and clear them. Clearing the DTC(s) will also clear the bothersome Malfunction Indicator Lamp (MIL, or Check Engine Light) on your instrument panel. In my case, I found the Actron OBD II (OBD2) PocketScan Reader to be cheap, simple, and what I needed: Actron OBD2 PocketScan Reader. I bought mine from amazon.com for under $50 in Spring 2008. If you are in a hurry and can’t wait, I did notice that Sears retail stores also carry it, albeit for a higher price $79.99 before tax.

- Clifford Vincent Arrow

P.S. As far as your Auto Store saying that the MIL will turn itself off, let me quote the relevant section from my Actron OBD2 PocketScan Reader: "Some manufacturers will turn the MIL off if a certain number of drive cycles occur without the same fault being detected." I can't say firsthand if the Lexus LX470 will turn off the P0150/P0155 DTC by itself since I used my OBD2 reader to reset it immediately after the job.

Big thanks for your pictures and great directions for replacing the CO2 Sensor on my 1999 LX470. The job went really well and everything was just as you had explained it. I went to an Auto Parts store and they pulled the code for me first so I know what the problem was. Ordered the Sensors on line and installed them today. My question is in regards to resetting the Check Engine light. Do I need to do an erase of codes? Because the Auto Parts store will not do that for me. They claim it is against the law and that the light will just go off on its own after a week or so. I am leaving on a trip next week and don't want to take the chance that I still have a problem. Do you have any advice?