Need help to locate Bank1

[Samiii]

Hi fellows I am owning Toyota Aurion sportive 2006, I am facing issue it's engine light comes on I put the scanner and got the code P0420 catalyst system efficiency below threshold bank 1 as my research it's O2 sensor if I am not wrong but can't not locate which sensor is bank1 as it have 4 sensors is any one in this forum can help me out so I will get straight to change that sensor.

Thanks in advance 

[KAA]

Hi Samiii, try the link below to see if that is of any help, it does suggest further checks to ensure it really is the 02 sensor

https://www.700r4transmissionhq.com/p0420-toyota-aurion/#:~:text=The P0420 code in a,sensor (before the converter).&text=Service Engine Light– Often%2C this,the Toyota Aurion P0420 code.

Good Luck

KAA

[KAA]

Also read in Aurion/TRD thread there are a few article's from Campbeam about the P0420 issue as well

KAA

Edited July 13, 2020 by KAA

[campbeam]

Bank 1 is for No.1 cylinder. In the Aurion, it is the rear bank closest to the firewall.

https://www.youtube.com/watch?v=Zpd-5z32ZlY

Toyota Camry How do you replace a bank 1 sensor 1 A.docx

[Tony Prodigy]

Looks like a bugger of a job guys. I'll have a snoop around there next time I'm under.