Question about Jeep 2002 Liberty Limited Edition

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Both downstream sensors codes are showing

Wondering what caused both downstream o2 sensors to malfunction at the same time

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: 97 jeep v6 grand cherokee 02 senor...

left side downstream

Posted on Oct 15, 2008

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SOURCE: Po136- bank 1 sensor 2

this code is for the 02 sensor heater...there is a relay that sends the voltage to the sensor that may have malfunctioned or there may be no voltage to it

Posted on Jan 26, 2009

  • 1 Answer

SOURCE: The check engine light is on....when hoocked to a

Disconnect Neg Battery terminal for 5 minutes, it will reset your codes

Posted on Mar 20, 2010

onebadsnakeb
  • 147 Answers

SOURCE: check engine light is on.

May need to disconnect Positive battery cable for a few minutes to reset codes.

Posted on Sep 02, 2011

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What means catalyst Efficiency below normal


      Got it scanned and it's P0420: Catalyst efficiency below thresholdbank 1. They said it could be a bad catalytic converter or oxygen sensor. I borrowed a scanner and tried to measure the oxygen sensor readings over time.Sep 8, 2011

      civic - Check Engine code P0420 Catalyst efficiency below ...

      mechanics.stackexchange.com/.../check-engine-code-p0420-catalyst-efficie...
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    P0420 Error Code: Catalyst System Efficiency Below ...

    www.obd-codes.com/p0420
    P0420 OBD-II Trouble Code. Technical Description. Catalyst System Efficiency Below Threshold (Bank 1). What does that mean? This diagnostic trouble code ...

    P0420 Code Fix How Its Done Catalyst Efficiency Below ...

    ? 4:25
    https://www.youtube.com/watch?v=-c8090n1Ihs
    Jun 20, 2014 - Uploaded by ACE AUTOS UK
    Here is a tutorial on P0420 code fix catalyst efficiency below threshold How To Diagnose a p0420 code ...

Jan 26, 2016 | Cars & Trucks

2 Answers

I have a 2010 Buick Lacrosse that had the P0420 code. Replaced the Bank One Cat and the code and the check engine light came on again with the same code.


Did they use an original equipment cat from the dealer or an aftermarket one? Aftermarket cats can cause more problems than they fix. There very few that I will personally install.

are they monitoring downstream O2 sensor data to see if the O2 sensor may be biased high? If the cat is doing its job the downstream O2 sensors will read a lower voltage. Tricking the vehicle into running rich or lean will cause this voltage to change ( unplugging a coil will cause the Downstream O2 to read high as the cat tries to burn off the extra fuel. Unplugging a fuel injector will cause the downstream O2 sensor to read low as extra air is being pushed thought the cats). Making sure the downstream O2 sensors are capable of switching should be part of the diagnostics.

Are you sure they replace the right cat? There are 5 different engine options for this car. If you let me know what engine you have I can let you know what bank is bank 1.

Feb 20, 2015 | 2010 Buick LaCrosse CXL

2 Answers

I have these codes coming up on my 2005 Dodge Ram. 5.7 liter motor: P0406 P2096 P0137 P2299 Thank you.


code #0406 = egr position sensor circuit high ( stuck egr valve or bad egr sensor most likely sensor )

code #2096 = downstream fuel trim system lean ( see next code )

code #0137 = O2 sensor bank 1 sensor 2 circuit low ( replace rear O2 sensor driver side )

code #2299 = brake peddle position/accelerator pedal position incompatible. ( hav you been power braking this truck? ) ( brake light was on wile accelerator was being pushed )

Mar 17, 2011 | 2005 Dodge Ram

1 Answer

Check engine light is on shows code po141,2001 tundra v8


"O2 sensor heater circuit malfunction (bank 1 sensor 2)."

If you have dual exhaust and two catalytic converters, this sensor is the one downstream of the converter on the side with No.1 cylinder. the internal heating element in the sensor is faulty or the wiring to that portion of the sensor (the heating element) is faulty.

Feb 09, 2011 | Toyota Tundra 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

2004 Dodge Stratus Sedan. engine light stays on,


Take the vehicle to any auto parts store that offers to read the fault codes with a scanner for free and find out what that code is. If it shows Upstream or Downstream O2 sensor replace the O2 Sensor. There is a catch, dodge had an issue in the 2000 - 2004. The ECM will show a fault code that indicates the Catalytic converter is faulty. This is actually a faulty Downstream O2 Sensor. If you get a Catalytic converter fault code replace the O2 sensor first if you still have the problem then replace the converter.

Jun 25, 2010 | 2004 Dodge Stratus

3 Answers

Code po430 not sure what maybe converter


One of three (3) possibitlies:
1. Catalytic Converter is malfunctioning.
2. O2 Sensor is malfunctioning. This will be the O2 Sensor located on the Catalytic Converter. However you should check and/or replace both sensors if needed.
3. You have an Exhaust Leak.
In Order of checking:
A. Check and Repair any Exhaust Leak.
B. Replace the O2 Sensor on the Catalytic Converter 1st. Also Known as the Downstream O2 Sensor or HO2 Sensor.
C. Replace the O2 on the Exhaust Manifold prior to the Catalytic Converter. Also Known as the Upstream O2 Sensor.
D. Replace the Catalytic Converter.
Let me know if this helped, or if you have any additional information, problems or questions. Feel free to contact me at FixYa.com!

Feb 01, 2010 | 1998 Ford Explorer

1 Answer

What is P0430 trouble code


Code P0430 - For Continuous Memory Only -- Check for missfire detection monitor (dtc) -- Bank 2 catalyst system effciency is below acceptable threshold -- possible causes are
-Faulty HO2S
-Faulty ETC sensor
- High Fuel Pressure
- Damaged exhaust components
- Oil Contamination
- Cylinder Missfire
- Downstream O2 sensor improperly connected
- Retarted Spark Timing
Most times the problem is the Downstream O2 sensor is defective

Dec 08, 2009 | 2002 Ford Escape

1 Answer

Check engine light is on


P0136 = O2 Sensor Circuit Malfunction (Bank 1, Sensor 2)

Which would be the oxygen sensor after the converter.

Jun 13, 2008 | 1997 Geo Metro

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