In the exhaust manifold of the front bank or before the cat converter
bank 2 is closest to the grill and bank one is next to the fire wall
the heated oxygen sensor is before the cat converter and the normal oxygen sensor is after the cat converter
SOURCE: Replacing bank 1 sensor 2 and bank 2 sensor 1 oxygen sensors
BANK ONE IS THE REAR BANK OF CYLINDERS AND TWO THE FRONT BANK
SOURCE: where is the bank 2 sensor 1 located.
Oxygen sensors are always numbered like this:
Bank 1 sensor 1
Bank 2 sensor 1
Bank 1 sensor 2
Bank 2 sensor 2
some manufacturers use a kind of shorthand that reads different, but means the same thing:
Sensor 1/1 or O2s 1/1
Sensor 2/1 or O2s 2/1
Sensor 1/2 or O2s 1/2
Sensor 2/2 or O2s 2/2
Bank 1 is always the side of the engine where cylinder number 1 is located and, of coarse, Bank 2 is the opposite side.
On a 4 cylinder engine, there is only 1 bank and it is always referred to as Bank 1.
Sensor 1 is always the upstream sensor (The one located BEFORE the catalytic converter)
Sensor 2 is always the downstream sensor (the one that is located AFTER the catalytic converter.
Most GM engines have #1 cylinder located on the left bank, (or Driver's Side) of the engine,
So, the answer to your question would be that you are looking for the sensor located before the catalytic converter on the right (or Passenger Side) of the truck.
SOURCE: location of the bank 1 sensor 2 O2 sensor on a 2001 ford escape
B1 means the sensor is located on the same bank of the engine that has the #1 cylinder. B2 is located on the opposite bank.
S1 means the sensor is located BEFORE the catalytic converter
S2 means the sensor is located AFTER the catalytic converter
You didn't say which engine you have, so I've included the diagrams of both 4 cyl and 6 cyl so you can see the banks
SOURCE: Code p0141 02 Sensor Heater Circuit Malfunct Bank #1 Sensor2
after the catalytic converter on the driver side in the exhaust pipe.
Testimonial: "Awesome info. Thanks!"
SOURCE: check engine light P0031 code,
sensor one is before the converter. Sensor 2 is after the converter. :o)
This fault code refer at Oxygen O2 Sensor Circuit Low Voltage (Bank 2, Sensor 2), and basically means the PCM detected either an excessive current draw, or an open or short in the circuit powering the oxygen sensor's heater circuit. This is in reference to the Heated Oxygen Sensor (2) located rear of catalytic converter (Bank 2).
A code P0161 may mean that one or more of the following has happened:
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