Hello,

I have a 2004 ES330 with check engine code P0136. From what I gathered on line it's a bank 1 sensor 2 that will need to be replaced. I have located 4 oxygen sensors in the engine compartment:

1 in front of the engine behind the radiator
1 in back of the engine by the firewall
1 below the engine up front by the radiator on the right side pipe
1 below the engine up front by the radiator on the left side pipe

Which one of these is the correct bank 1 sensor 2 that I will need to replace? I searched the forum using the search button, but there is no specific P0136 code relates to an ES330. Thanks in advance!!!

"Bank" is which cylinder bank of the V it controls, identified by starting w/either #1 or #2 cylinder from the front. Bank "1" on a Toyota is the R side of the engine, or along the firewall in your transverse application.

"Sensor #" is order from exhaust heading downstream. #1 is before the catalytic converter, #2 after.

Identify your rear exhaust manifold and it will be the one downstream.

it takes a hundred or so miles to reset the computer or you can use a scanner to shut off/erase the code but, you will still need to drive a hundred miles or so to reset the computer, the emission computers know when a ecu has been reset.