Question about 1997 Mazda 626

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Masada 626 1997 o2 sensor code po140 bank 1 sensor 2

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Time to replace the O2 sensor

Posted on Dec 28, 2016

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2 Answers

What does code PO 140 mean


Yes, PO140: O2 Sensor Circuit No Activity Detected Bank 1 Sensor 2

Apr 06, 2014 | 1997 Buick Riviera

1 Answer

2001 oldsmobile getting po140 code


The code is for bank one sensor two not working. The O2 sensor after the catalytic converter is not sending a signal to the computer or the signal is not changing.

Sep 26, 2012 | 2001 Oldsmobile Alero

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8/2009 computer programming failed, threw a rod and I replaced the engine in my 2001 Nissan Pathfinder. No failsafe mode apparently. I replaced both front O2 sensors and installed a new computer and had...


P0134 and P0154-o2 circuit not actively detected-bank 1 and 2, side 1

Nissan TSB Reference # NTB02-015 (in canada). Might be a similar TSB in the US-also this;

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It does sound like it is an electrical problem, possibly in a harness (damaged) or the ECM had major issues that a reflash could not overcome.

Jan 08, 2011 | Nissan Pathfinder Cars & Trucks

3 Answers

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)

P0147....O2 Sensor Heater Circuit (Bank 1 Sensor 3)

P0340....Camshaft Position Sensor 'A' Circuit (Bank 1 or Single Sensor)

Sep 20, 2010 | 1997 GMC Sierra

1 Answer

1996 Chevrolet pick up -- Service engine soon light stays on. Checked gas cap. It has code # PO140. Any help would be appreciated.


p0140 is 02 sensor ckt no activity ( bank 1 sensor 2). bank 1 sensor 2 is in back of convertor, it will need replaced it is sending wrong info to pcm.

Sep 16, 2010 | Chevrolet C1500 Cars & Trucks

1 Answer

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"

Aug 06, 2010 | Hyundai Elantra Cars & Trucks

1 Answer

Two codes...need the actual physical location of oxygen sensors


pop the hood and look behind the engine in the middle....you'll see o2 sensor on the top of the exhaust pipe unplug it and remove it ............second o2 sensor is located on the same pipe under the passanger seat under the car

Mar 04, 2009 | 1996 Plymouth Grand Voyager

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