Left Bank And Right Bank

[Blake_batonrouge]

I have CEL code 28 - Main oxygen sensor signal (on right bank) Which side is the right bank? Is it driver or passenger side? Also how do you diffrentate between the two? From sitting in the drivers seat or standing outside looking into the engine?

[gordonw]

Right bank is passenger side.

[Blake_batonrouge]

Also is the main sensor before or after the CAT? I am trying to get the direct plug in from Autozone and it is offering a before and after cat sensor.

[jeffls400]

Main is before the catalytic converter.

[SKperformance]

As far as i remember the left /bank 1 and right /bank 2 are looking towards the engine from the point of the transmission.