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I got the code for a bad O2 sensor Bank 1 sensor 2 and I am trying to locate where it is. Every thing i have read says it is behind the Catalytic Convertor but I don't have one behind the catalytic convertor. Any help would be appreciated.

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Bank 1 --is on the side that cylinder #1 is on

Sensor 2 --is the one farthest from the motor

eg: in the outlet of the cat

Posted on Mar 13, 2011

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I have a 98mitsubishi montero my check ingine light is on i hooked up my computer to read the code it reads bank 1/2 P0161oxygen sensor which oxygen sensor is the one on the driver side or passenger side


Bank 1 is on the side that cylinder number 1 is on, and 2 is on the other . Look up your firing order and you should find it fairly easily. And sensor 1&2 refers to before or behind catylitic converter.

Mar 28, 2015 | 1998 Mitsubishi Montero

2 Answers

Ford freestar 2004 where is the O2 sensor #1 located


There is 4 senors the bank 1 sensor 1 is located in front of the LH (Drivers side) catalytic converter
Hope this helps

Jun 22, 2014 | 2004 Ford Freestar

2 Answers

O2 SENSORS LOCATIONS


The O2 sensors are located in the exhaust pipe just off the engine exhaust manifolds and before the Catalytic Converter. A V6 has 2 of them, one for each bank of cylinders, they are referred to as the "Bank 1 and Bank 2 Upstream sensors". There is also a sensor that looks like a O2 sensor it is located behind the Catalytic Converter, its job is to monitor the efficiency of the Catalytic Converter and signal you with a check engine light and a code P0420 if the Cat is not doing its job. Each sensor has its own set of fault codes if problems are sensed in the O2 levels in the exhaust (fuel control problems) and other problems like the heater circuit in the sensor is defective.

Oct 01, 2011 | 1992 Chevrolet Lumina

1 Answer

Location of o2 sensor bank 1 sensor 2


Bank 1 sensor 2 is the O2 sensor behind the catalytic converter.

Apr 08, 2011 | 1999 Nissan Sentra

1 Answer

CODE PO155 BANK2 SENSOR 1 WHERE IS THIS SENSOR LOCATED?


A code P0155 may mean that one or more of the following has happened:
* O2 Heater element resistance is high
* Internal short or open in the heater element
* O2 heater circuit wiring high resistance
* open or short to ground in the wiring harness

Possible Solutions:
* Repair short or open or high resistance in wiring harness or harness connectors
* Replace oxygen sensor (cannot repair open or short that occurs internally to sensor)


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.

Hope helps (remember to rate this).

Oct 02, 2010 | 2002 Mitsubishi Montero

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).

---
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

3 Answers

Where is the b1 s1 o2 sensor located on my 2003 acura rsx?


bank 1 sensor 1 il locates right infront of the catalytic converter . bank 1 sensor 2 is located in the catalytic converter

Dec 19, 2009 | 2003 Acura RSX

3 Answers

Pulled code p0420 on 99 chevy astro, 2wd, v6


from what i am finding the code means o2 sensors. they recommend replacing them and if this does not work than replacing the cat converter

The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.

causes

A code P0420 may mean that one or more of the following has happened:
  • Leaded fuel was used where unleaded was called for
  • An oxygen sensor is not reading (functioning) properly
  • The engine coolant temperature sensor is not working properly
  • Damaged or leaking exhaust manifold / catalytic converter / exhaust pipe
  • Retarded spark timing
  • The oxygen sensors in front and behind the converter are reporting too similar of readings
possible soloutions

Some suggested steps for troubleshooting a P0420 code include:
  • Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required.
  • Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
  • Inspect the downstream heated oxygen sensor (HO2), replace if necessary
  • Replace the catalytic converter
One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.


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Aug 20, 2009 | 1999 Chevrolet Astro

1 Answer

O2 sensor location 1997 pontiac grand am 2.4 4 cyl auto trans


BANK 1 SENSOR 1 IS THE ONE IN THE EXHAUST MANIFOLD. BANK 2 SENSOR 2 IS BELOW THE CATALYTIC CONVERTER.

P0171 SHOULD GO AWAY WITH A GOOD O2 SENSOR BUT DO CHECK FOR VACUUM LEAKS TO BE SURE. 3.1/3.4L ENGINES HAVE A BAD DESIGN INTAKE MANIFOLD GASKET, THE LEAK OIL, COOLANT, AND AIR.

Jul 13, 2009 | 1997 Pontiac Grand Am

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