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.
on cylinder 1 side mounted on the manifold
It is behind the engine, after the catalyst.
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