Which o2 sensor is bank 1 sensor 2

[Sean13]

I am getting a check engine light so I went to auto zone and had the code checked. It came up PO141: bank 1 sensor 2
Which O2 sensor is that ?
Thanks for the help !

 

[black_demon69]

I am getting a check engine light so I went to auto zone and had the code checked. It came up PO141: bank 1 sensor 2
Which O2 sensor is that ?
Thanks for the help !

bank 1 is the side with cylinder 1 sensor 2 is the one after the catalytic converter on the same side.

 

[RonD]

+1 ^^^^

Bank 1 Sensor 1 is O2 sensor Passenger side closest to engine
Bank 2 Sensor 1 is O2 sensor Drivers side closest to engine

Bank 1 Sensor 2 is O2 sensor Passenger side farthest from engine(behind Cat converter)

Only on Dual exhaust systems
Bank 2 Sensor 2 is O2 sensor Drivers side farthest from engine(behind Cat converter)

Sensor 1's are used by computer to adjust fuel trims directly

Sensor 2's are used to test if Cat converters are working, cleaning up exhaust, also used in Long Term Fuel Trims

A 1995 and up 4cyl engine will only have Bank 1 sensor 1 and sensor 2

 

[Sean13]

Thank you !