# Where is the bank 2 sensor 1 located on a jeep wrangler 2003 rubicon

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Bank one is always the same side of the engine as the number one cylinder. Bank two is the opposite side of the enigine. Sensor refers to before or after the catalytic converter. Sensor 1 is before the cat and sensor 2 is after the cat. Let me know if you have any questions and I'll do my best to answer them. Thank you for using FixYa.com!

Posted on Feb 15, 2012

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Posted on Jan 02, 2017

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

Posted on Oct 20, 2009

SOURCE: PO135 Error Code

Bank one stands for the same side as the number 1 cylinder. Sensor 1 is the first sensor in the bank, (closest to the engine or upstream).
In most cases you will find it on the drivers side\left hand side of the engine and above the catalytic converter. Look for it on the lower portion of the exhaust manifold.

Posted on Sep 07, 2009

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.

Posted on Oct 17, 2009

Bank 2 is passenger side, sensor 1 is the one up closest to the exhaust manifold. Plug in type (just remove old and plug back into the wiring harness connector) is about $90 at Autozone. You can get a cheaper one that you splice but it's confusing to understand which wires to splice together. Don't forget to buy the special socket,$10, to remove and install the sensor. It's split up the side for the wires. Forget trying to use an open end wrench, socket is best.

Posted on Nov 18, 2009

sensor one , bank 2 ( bank 2 is where cylinder number 2 located, in this case it's in the front ) is in the front of the vehicle and mount before the catalytic converter, most likely on the exhaust manifold. the one after the cat ( or down stream is the sensor 2 )

Posted on Apr 13, 2010

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