Bank 1 Sensor 1- driver's side exhaust pipe Bank 1 Sensor 2-right before catalytic converter Bank 1 Sensor 3- right after catalytic converter Bank 1 Sensor 1- passenger side exhaust pipe Bank 1 Sensor 1- driver's side exhaust pipe Bank 1 Sensor 2-right before catalytic converter Bank 1 Sensor 3- right after catalytic converter Bank 2 Sensor 1- passenger side exhaust pipe
behind the cat
The bank 1, sensor 3, O2 sensor would be the O2 sensor post cat.
Assuming the engine is a 4.3L, bank 1 would be on the drivers side.
It is the sensor below the catalytic converter.
This would be the sensor after the catalytic converter.
3, sensor 1 bank 1, sensor 2 bank 1, sensor 2 bank 2
Bank one sensor one oxygen sensor
The one after the catalytic converter.
Inside the exhaust. there are two on each side.
It is behind the engine, after the catalyst.
on cylinder 1 side mounted on the manifold
bank #1 sensor #2 is the oxygen sensor that is past the catalytic convertor(some mechanics call it the downstream sensor)the sensor is located between the convertor and muffler you can use a 7/8 wrench or a oxygen sensor socket if you have one