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P0431 warm up cat efficiency low bank 2 and p0421 low bank 1

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6ya6ya
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Posted on Jan 02, 2017

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consaka
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SOURCE: 2 trouble code p0421 and p0421 pd

I believe this has to do with your catalytic converter. Sounds like it might be getting old. The older they get the slower they are to respond. this is due to contamination. Same is true for your Oxygen sensors.

Posted on Apr 03, 2010

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SOURCE: 2005 (4CYL) Mitsubishi Galant. P0431

BANK 2 IS O2 SENSOR NEAR THE CATALYTIC CONVERTER.

Posted on Apr 29, 2010

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SOURCE: I have a 1996 Mazda 626, the check engine light

The cooling fan must run or the car must be running into the wind to keep from cooking the engine. Physically turn the fan to see if it turns freely (cold engine). The computer reads coolant temperature and trips the fan relay on when normal temperature is reached. You need to read the control voltage at the relay to determine the problem. Possible bad temp sensor.

Posted on Jul 15, 2009

  • 4 Answers

SOURCE: codes p0421 and p0431

Check for air leak on vacuum hoses, and exhaust plus test health of O2 sensors b4 doing the CAT b/c CAT are the most expensive.

Posted on Oct 10, 2010

airjer995
  • 5332 Answers

SOURCE: P0421 warm up catalyst...below threshold (bank

A v-6 or v-8 engine will have two banks. Bank one is the side of the engine with the number 1 cylinder. Bank 2 is the other side of the engine. In your case Bank 1 is cylinders 1-3-5 on the back side of the engine closest to the firewall. Bank 2 is cylinders 2-4-6 on the other side of the engine.

You have two cats bank 1 and bank 2. There are two oxygen sensors before each cat that help determine fuel trim and are refered to as sensor 1 and two oxygen sensors after the cats that monitor cat efficiency and are referred to as sensor 2. The bank 1 sensor 2 O2 sensor is either providing a higher than expected signal or is switching like the sensor 1 O2's. If either of these has occurred the PCM detects that the cat is no longer working as it should and sets the code/turns on the check engine light.

9 times out of 10 it is a cat that has gone bad.

Posted on Nov 16, 2010

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My 2003 kia sedona won't pass emissions the codes are p0320 p0431. Help please


code p 0320 refers to crankshaft position(CKP) sensor /engine speed ( RPM) sensor ---circuit malfunction===causes --wiring---CKP/RPM sensor---ECM
code p 04310 refers to warm up catalytic converter, bank 2--efficiency below threshold===causes ---cat converter---wiring---HO2S 2
As it is not passing the smog test I would be replacing the HO2S sensor ( manifold or before the cat on bank 2 of the engine ) or more likely a failed cat converter
you may have had the P 0320 code for a long time and have not noticed a drop in performance but as cat converters have a lot to do with smog control , that is the area I would advise checking first

Jan 16, 2016 | Kia Cars & Trucks

1 Answer

2003 ES. What are the probable causes of DTCs P0421 and P0431?


code p 0421 refers to warm up cat converter bank 1--efficiency below threshold ===causes ---cat converter---wiring---HO2S 2
( heated oxygen sensor)
code p 0431 refers to warm up cat conveter bank 2--efficiency below threshold === causes cat converter --- wiring---HO2S 2
as the same HO2S appears in the cause of the fault I would be inclined to change it first
the HO2sS sensor is the one in the exhaust manifold or before the cat converter
and 2 is in the front bank of a V engine
use the special socket when removing/ replacing these sensors as an incorrect tool is the main reason for wire failures on the sensors

Dec 17, 2015 | 2003 Mazda MPV

1 Answer

Trouble code: p0431 on 2004 hyundai santa fe 3.5L. Wondering about possible solutions


p0431 is described as "warm up catalyst efficiency below threshold (bank 2)" This code is in the exhaust system air injection section of the trouble codes. Possible it relates to an oxygen sensor reading.

Dec 29, 2012 | 2004 Hyundai Santa Fe

1 Answer

Check Engine light problem. P0431 code problem. It's already being determined it's the oxygen sensor. But which one? Is it Bank 2 or Bank 1. If it's one of the Banks is it before or after the...


O2 Sensor codes are usually in the P0130- P016x range.
P0431 is Warm up catalyst efficiency bellow threshold Bank 2
Don't know what you're working with so just figure bank 1 comes off the bank with the number 1 cylinder.

Aug 30, 2011 | Mitsubishi Montero Cars & Trucks

1 Answer

Have a code p0431 on a passat 4motion


P0431 Warm Up Catalyst Efficiency Below Threshold Bank 2
The word Catalyst, means that the catalytic converter needs to be replaced because some of the warm up catalyst is not working initially when the car first starts up before it warms up.

Good luck on this repair.

Nov 12, 2010 | 2002 Volkswagen Passat

2 Answers

What are codes P1492, P0421 & P0431 on the 2002 Mazda Millenia?


po421 warm up catalyst efficiency below threshhold bank 1, 431 same on bank 2..

Feb 08, 2010 | 2002 Mazda Millenia

1 Answer

I went to the emission test and I have a vw 2000 and I didnt pass couse My car has three problems and they gaved me three different codes and I dont know what they mean p1423,p0431,p1411


p1423 Secondary Air Injection Bank 1 flow too low

P0431 Warm Up Catalyst, Bank 2 Efficiency Below Threshold/Limit

P1411 Secondary air injection fault, this is related to the P1423.

Sep 29, 2009 | 2003 Volkswagen Passat

3 Answers

I have a 2003 MPV with trouble code PO327 and PO431. What do these mean? Thank you.


P0327 Knock Sensor 1 Circuit Low Bank 1 or Single Sensor
P0431 Warm Up Catalyst Efficiency Below Threshold Bank 2


Sep 28, 2009 | 2003 Mazda MPV

1 Answer

Failure code P0431


The Bank 2 after-cat O2 sensor is detecting that the cat is not working as efficiently as it should. It could be a bad catalytic converter, bad O2 sensor, or an exhaust leak.

Sep 19, 2008 | Mitsubishi Montero Sport Cars & Trucks

2 Answers

Diagnostic codes for 2003 kia sorento


hi
P0431 :- (warm up catalytic converter bank 2 - efficiency below threshold )
test the catalytic converter it locate in exhaust gas pipe
test the heated oxygen sensor in exhaust gas pipe too near the engine
P0446 :- (evaporative emission (EVAP) system , vent control , circuit malfunction )
test wiring , EVAP canister purge valve , ECM engine control module
just ask for more abut DTC

Jun 18, 2008 | 2003 Kia Sorento

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