Bank 1 sensor 1 and bank 1 sensor 2 help
 

Help...
Can anyone help me with the location of bank 1 sensor 1 and bank 1 sensor 2 on a 2003 gs300. Looking for any info... Denso part numbers, upstream down etc... The error code for the bank 1 sen 1 was p0031 and the code for bank 1 sensor 2 is p0037

Thanks again

They're in the exhaust.

Did you try Google? I just took 2 seconds to type "gs300 bank 1 sensor 2" into Google and the very first result was a "how to" thread on this very forum. https://www.clublexus.com/forums/mai...ode-p0141.html

The diagram in that thread should be all the info you need to replace both sensors.

Put your flame suit on....

That diagram is very useful. I just did bank 1 sensor 2 and bank 2 sensor 1. It took alot of penetrating oil and heat but I got them replaced. Now I need to replace bank 2 sensor 2 which is under the passenger carpet. I put in two Bosch sensors from Autozone. If you cross reference the Denso part # to the ones listed on Amazon you can get them for well under $100. No flame suit needed yet my Lexus friend, I'm always glad to help. Others will not be so kind.

I did bank 2 sensor 2 with a generic Bosch sensor. It was a very easy job. It's probably easier than both of the Bank 1 sensors because you can get plenty of leverage on the sensor with a long breaker bar. Access to the plug under the passenger carpet is dead easy.

Looky HERE.

Did you just pry up the door sill with a screw driver to get under the carpet?

Nope. Just my fingers. You can just pull it up. It will pop out of it's retainers with a little bit of muscle.

Access to the plug under the passenger carpet is dead easy.http://www.mczz.info/12a.jpg