Help!!Check engine light on 2005 v6 SR5 4x4 T4R

[adperez1984]

Hi everyone I am new to this site I was recommended by a buddy…Well I have a 2005 4x4 v6 4.0L sr5 4runner. Recently I had my check engine light came on along with the popular vsc lights so I took it in to the dealer and had my cat-converter replaced under warranty since a PO430 code was found but few hours later my check engine light came back on along with the vsc lights so I decided to take it in to a shop to have the two 02 sensors which should have been (bank1 sensor 2) and (bank 2 sensor 2) if im correct replaced since the same code PO430 came back on and it has been a common issue with many of T4R owners but know my lights are back on and I am getting two codes a PO137 and PO138 ( both refer to bank 1 sensor 2) that I never had. So I think these guys might have replaced the wrong sensors since the PO137,PO138 codes never came up until these two sensor where replaced. So my questions are the following, are the electrical connections for sensor 1 and sensor 2 in both the banks the same or are they two different size of connection. Where is bank 1 and bank 2 located on my 4runner. And if you guys can guide me and clear up where bank 1 sensor 1 and bank 1 sensor 2 are located . If any of u have diagrams to help me I would really appreciated it thank you….sorry about the long post im just frustrated this issue thanxs…

 

[toto]

On the 4th Gen V6 4Runner (engine 1GR-FE), bank 1 is on the passenger side with odd-numbered cylinders. Bank 2 is on the driver's side with even-numbered cylinders. Cylinders 1 and 2 are closest to the radiator.

Just to make life more interesting, the 4th Gen V8 4Runner (2UZ-FE) has it flipped with bank 1 (odd numbers) on the driver's side and bank 2 (even numbers) on the passenger side. Like the V6, cylinders 1 and 2 are closest to the radiator.

Sensor 1 is always located before the catalytic converter, and sensor 2 is always located after the catalytic converter (moving in the direction of the exhaust flow).