Samiii

Need help to locate Bank1

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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 

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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

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

KAA

Edited by KAA

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

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