Question about 2001 Dodge Neon

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O2 Sensor Bank 1 Sensor 2

Hello,
I have codes coming up P137 , P139, P140, P141 all are from Bank 1 Sensor 2...
Where is the sensor located ?
I had the car checked before and was told the Cat. converter was clogged...I had it replaced... the check engine light comes off and on every several days...
thanks

Posted by on

  • Anonymous Mar 14, 2014

    sensor 2 bank 1

  • Anonymous Mar 19, 2014

    have changed o2 sensor and catalytic converter; light is off for several days then comes on again

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  • 39 Answers

That is the O2 sensor right behind the cat. converter. When the cat is clogged it can shoot contaminates in the O2 sensor so sometime just cleaning the sensor will make it work again, if not it will need to be replaced. Mark - ABKS

Posted on Oct 09, 2008

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P0036 and p141 showed up on my obd angine light


Code 141 is for a problem with the heater circuit for the O2 sensor bank one sensor two.
Code 36 is for the same issue.
Bank one sensor two is the sensor after the cat converter. The circuit would need to be tested.
The O2 sensors have a heater built in to make them work faster during engine warmup.

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Position of oxygen sensors


all you have to do is follow the exhaust from the manifold back and you will come to the sensors. bank 1 O2 sensor is on the bank cylinder 1 is and bank 2 O2 sensor is located on the bank cylinder 2 is on. the first sensors you come across is sensor 1 then the next sensor you come across sensor 2 and so on. so you can have a sensor code like bank 1 sensor 2 meaning the sensor on bank one but the sensor is the 2nd sensor in the exhaust.

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Carquest can help you get the correct part and help you locate it.

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Reccieved P0141, P0147, P0340 as emission diagnostic trouble codes. What do these mean?


P0141....O2 Sensor Heater Circuit (Bank 1 Sensor 2)

P0142....O2 Sensor Circuit Malfunction (Bank 1 Sensor 3)

P0143....O2 Sensor Circuit Low Voltage (Bank 1 Sensor 3)

P0144....O2 Sensor Circuit High Voltage (Bank 1 Sensor 3)

P0145....O2 Sensor Circuit Slow Response (Bank 1 Sensor 3)

P0146....O2 Sensor Circuit No Activity Detected (Bank 1 Sensor 3)

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Code p137 could it be the oxygen sensor


P0137 refers to the second oxygen sensor on the car. It means the O2 oxygen sensor's voltage remained low for longer than 2 minutes. Bank 1 Sensor 2 is located to the rear of the catalytic converter. This rear sensor's signal is less active than the signal produced by the sensor closer to the manifold. However, if the car senses the sensor is inactive, this will set off the check engine light as well.

Replace that second sensor and it should cure your problem.

I hope this is helpful, if you need more help. Please feel free to re-post at FixYa for all you automotive needs.

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2006 hundai elantra P2270 code. If this is an O2 sensor, which one?


Possible O2 sensors:

P2270 O2 Sensor Signal Stuck Lean Bank 1 Sensor 2
P2271 O2 Sensor Signal Stuck Rich Bank 1 Sensor 2
P2272 O2 Sensor Signal Stuck Lean Bank 2 Sensor 2
P2273 O2 Sensor Signal Stuck Rich Bank 2 Sensor 2
P2274 O2 Sensor Signal Stuck Lean Bank 1 Sensor 3
P2275 O2 Sensor Signal Stuck Rich Bank 1 Sensor 3
P2276 O2 Sensor Signal Stuck Lean Bank 2 Sensor 3
P2277 O2 Sensor Signal Stuck Rich Bank 2 Sensor 3
P2278 O2 Sensor Signals Swapped Bank 1 Sensor 3 / Bank 2 Sensor 3
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This is Bank 1 (closer to the dash panel) Sensor 2 (located after the catalytic converter).

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Note: A malfunctioning front oxygen sensor may cause fuel trim codes to set.
  1. Several Diagnostic Trouble Codes use specific terminology to refer to sensor location. The illustration and key below explain the following terms:
  2. Engine BANK Bank 1 is closer to the dash panel, (also referred to as RH or right hand). Bank 2 is closer to the radiator, (also referred to as LH or left hand).
  3. UP Refers to Sensor 1 or "front sensor". It is located closer to the exhaust manifold and before the catalytic converter.
  4. DOWN Refers to Sensor 2 or "rear sensor." It is located after the catalytic converter.
  5. The following examples show how to interpret oxygen sensor terminology:
  6. B1/S1 = Bank 1/Sensor 1 = Dash panel side, BEFORE the catalyst or "upstream"
  7. B2/S2 = Bank 2/Sensor 2 = Radiator side, AFTER the catalyst or "downstream"

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The code will tell you which O2 sensor it is.
The code will point to either bank 1 sensor 1; bank 1 sensor 2; bank 2 sensor 1; bank 2 sensor 2.

From what I remember with a focus, it should only have 2 sensors, sensor 1 will be located before the cat, and sensor 2 will be located after the cat.

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