Question about Mitsubishi Cars & Trucks

Open Question

What is code p0431 in 03 montero

Bank2 below threshold downstream right

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

  • 1201 Answers

SOURCE: engine light comes on, had code come up Catalyst

Check and see what the codes are this time, no need to replace something you don't have to.

Posted on Mar 15, 2009

  • 234 Answers

SOURCE: catalyst efficency below threshold

The code Im assuming is po420, or po430. In either case it means the catalytic converter is inert and no longer has the ability to convert hydrocarbons to CO.

Posted on Oct 18, 2009

  • 97 Answers

SOURCE: 420 code catalyst system efficiency below

You could have an enefficient converter. Question is what caused it to go bad? I have attended seminars on code 420, Possible causes are lack of spark or clogged fuel injectors. there have been times where the spark plug wire lays on the engine and over time it wears a weak spot in the side of the wire, its not enough to throw a miss fire code but it keeps the full amount of spark from getting to the plug and not burning the all the fuel in the cyl. A leaky injector would also cause to much fuel to be deliverd into the cyl and not get burned.

Hope this helps.

Posted on Jan 20, 2010

  • 1857 Answers

SOURCE: i have 2 trouble codes on my 2002 dodge ram 1500

9 times out of then this points to bad cat and the cat will need be changed.

Other things that can cause this code are an exhaust leak before the front 02 sensor or the car in need a of a tuneup badly. Generally if this problem is sensor related you would have other codes also.

If you want to know of the cat is bad the computer stores data and when you have a data scanner that can access MODE 6 the data can indicate whether your cat is the issue or not. Its a bummer you have to have this diagnosed by a professioal to get this data since the scanners do not get loaned out.

I have heard of alot of cats that were replaced for no reason because of other reasons so be cautious on how to address this because your not going to be able diagnose this without a data scanner and all the specifications for the sensors.

Posted on Mar 30, 2010

ZJLimited
  • 17970 Answers

SOURCE: my car show me service

P0431 - Warm Up Catalyst Efficiency Below Threshold (Bank 2)

Basically this means that the oxygen sensor downstream of the catalytic converter on bank 2 is detecting that the converter is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.

Symptoms: You will likely not notice any drivability problems, although there may be symptoms such as a rough/hard idle when cold.

Causes: A code P0431 may mean that one or more of the following has happened:
* The catalytic converter is no longer functioning properly
* An oxygen sensor is not reading (functioning) properly
* There is an exhaust leak

Possible Solutions: Inspect for exhaust leaks. Next step is to measure the voltage at the oxygen sensor on Bank 2. In fact, it would be a good idea to test each oxygen O2 sensor while you're at it.

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.

Hope helps (remember to arte and comment this).

Posted on Sep 22, 2010

Testimonial: "thanks very much"

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

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...
    Feedback

    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

1 Answer

Troubleshooting code p0420


P0420 = Bank 1 catalyst system efficiency below threshold. This DTC (Diagnostic Trouble Code) is set when the O2 downstream sensor indicates/measures the amount of hydrocarbons/oxygen present in the exhaust after it passes through the converter. When this sensor detects exhaust gasses identical/near identical to the upstream O2 Sensor (the actual gasses at the exhaust port - before the converter), it will set this 'efficiency below threshold' code. The catalyst has failed to 'convert' the exhaust gasses to CO2 + Water.

Sep 11, 2011 | 2006 Hyundai Sonata

1 Answer

I have 99 plymouth neon,sevice engine light keeps coming on,have replaced both upstream and downstream oxygen sensors,but the code keeps telling me there is no activty on the downstream sensor,have checked...


if it is a trouble code for the downstream oygen sensor, or cataylist below threshold, it pertains to the catalyitic converter. I would check that if i understand you correctly.

Mar 25, 2011 | 1999 Plymouth Neon

2 Answers

What sensor (upstream?downstream) is the P0154 code referring to?


P0156 code means :Oxygen Sensor Circuit No Activity Detected (Bank2, sensor1) I'm not sure but i think it's on the exhaust manifold!!! protuha_31.jpg

Feb 11, 2011 | 2001 Mitsubishi Montero Sport 4WD

1 Answer

E-Check Light P0125 and pending p1153/p1155. Replaced ECT and codes reappear. Where is this Bank2 Sensor1 located on my 1998 toyota camry v-6 auto with air. P1155Code book described as AF sensor.


Air/Fuel Sensors are mounted upstream of the catalytic converter. They are located on the exhaust manifold side of the catalytic converter (pre-converter - Sensors 1). Oxygen Sensors are mounted downstream of the catalytic converter (post-converter - Sensors 2). The catalytic converter has two chambers (left and right). Bank1 is left, drivers side. Bank2 is right, passengers side. The Bank2 Sensor1 sensor (Air/Fuel Sensor) is the one located on the 'right and ahead' of the converter. The PowerTrain Control Module (PCM) is reporting that the heater or circuit ( wiring / plug-in) of the sensor is malfunctioning.

Jan 31, 2011 | Toyota Camry Cars & Trucks

1 Answer

P0430 catalist efficiency below threshold (bank 2)


You most likely have a failed exhaust converter
That would be the left side of the engine.
PO430 Bank2 left
PO420 Bank 1 right

Dec 02, 2010 | 1998 Ford Windstar

2 Answers

Code p0420 on 97 lexus es300


P0420 is catalyst below threshold. It is triggered via the rear o2 sensor (post cat), so you may want to check that sensor to make sure it's functioning properly.

Oct 01, 2010 | 1997 Lexus ES 300

1 Answer

My car show me service engine sonn and the scanner say p0431 warm up catalyst efficiency below threshold (bank2) what is this?


P0431 - Warm Up Catalyst Efficiency Below Threshold (Bank 2)

Basically this means that the oxygen sensor downstream of the catalytic converter on bank 2 is detecting that the converter is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.

Symptoms: You will likely not notice any drivability problems, although there may be symptoms such as a rough/hard idle when cold.

Causes: A code P0431 may mean that one or more of the following has happened:
* The catalytic converter is no longer functioning properly
* An oxygen sensor is not reading (functioning) properly
* There is an exhaust leak

Possible Solutions: Inspect for exhaust leaks. Next step is to measure the voltage at the oxygen sensor on Bank 2. In fact, it would be a good idea to test each oxygen O2 sensor while you're at it.

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.

Hope helps (remember to arte and comment this).

Sep 22, 2010 | Mitsubishi Endeavor Cars & Trucks

1 Answer

Getting OBD codes p0420 and p0430, how to fix these issue with my 2001 Audi A6


2001 Audi A6
EOBD code: P0420
Fault location: Catalytic converter system, bank 1 - efficiency below threshold
Probable cause: Catalytic converter, wiring, heated oxygen sensor 2 (downstream)

EOBD code: P0430
Fault location: Catalytic converter system, bank 2 - efficiency below threshold
Probable cause: Catalytic converter, wiring, heated oxygen sensor 2 (downstream)

Sep 14, 2010 | 2001 Audi A6

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

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

12 people viewed this question

Ask a Question

Usually answered in minutes!

Top Mitsubishi Experts

yadayada
yadayada

Level 3 Expert

74945 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22095 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

7697 Answers

Are you a Mitsubishi Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...