Question about 2003 Lincoln LS

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2003 Lincoln ls, v6, 3.0L has code p0430 for catalytic converter effeciency below threshold. Bank 2. What side is Bank 2 and all the parts I will need?

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Code p0430 could mean that you catalytic converter is no longer "cleaning" your exhaust gases. In your car, it's possible to have more than one catalytic converter (V6 engines have two banks of cylinders and could have a cat on each side).

Bank 1 is the side of the engine where cylinder no. 1 is located. Bank 2 is, you guessed it, the other side. If you look up the firing order of the engine, you will see which cylinder is #1.

Although catalytic converters are not cheap, it is recommended that they be replaced in pairs due to the fact that the other catalytic converter may trigger your "check engine" light soon after you replace the first. Also, it may also be a good time to throw in new oxygen sensors.

Posted on Apr 04, 2011

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The number 1 spark plug is in bank one. ineffective cat's is a hard code to dianose correctly as thiers many things that can cause the code to set and many temporary things that don't last long that can set the code. I won't try to fix this code if it's the on;y one untill it has been reset more than a few times and no othe codes come up. The oxagen seners can fail, There's four! And they conpare readings with each other to set this code. running though water and cooling one or some of them will set the code. changing to a newq tank of gas that some different burning qualities will set this code ( and once resetr might not reset again till the next seasoal chnge in the fuel mixture from Summer to winter gas happens as it cools or warms again or even going from one staste to another to but fuel as thier polution laws are different or even some areaas that require special fuels like E85. Your car can run on it just fine if all systems are in good order but it might set the code as the system retunes to the differeent fuel. Code 420 also follows this same story.

Posted on Apr 04, 2011

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Related Questions:


I get OBD codes P0420 and P0430

P0420 and P0430

P0420 means Catalyst System Efficiency Below Threshold, Bank 1

P0430 means Catalyst System Efficiency Below Threshold, Bank 2

It means that the O2 sensors are good, and the O2 sensors are telling you that your catalytic converter, in the exhaust system is not working fine, as its emissions are polluting the air too much.

The catalytic converter is part of the exhaust system. The way to test this part is by doing an emission test. The two OBD codes that you are getting are already a test telling you that the converter must be replaced, unless an emission test done at a garage says the opposite.

This kind of problem will trigger the check engine light, and your car will also waste too much fuel.
You also risk to get in trouble if the car goes through an Air Pollution control, as the car won't pass an emission test in this condition.

To conclude, the Catalyst System must be replaced, the O2 Sensors are fine.

This is a repair that should be done at a garage, however you can find DIY instructions here:How to Replace a Catalytic Converter or you can get more detailed instructions, and step by step illustrated procedure purchasing a repair manual.

on May 27, 2009 | 2003 Chrysler 300M

1 Answer

What are the probable causes of DTC P0430?

code p 0430 refers to catalytic converter system , bank 2 --efficiency below threshold=== causes --cat converter---wiring---HO2S 2
( that is the sensor in the exhaust manifold or pipe before the cat converter for bank 2--front bank)

Mar 27, 2016 | 2001 Nissan Sentra

1 Answer

Engine Code PO430

P0430 Ford - Catalyst System Efficiency Below Threshold Bank 2

Possible causes - Three way catalyst converter Bank 2
- Exhaust tube
- Intake air leaks
- Fuel injectors may be faulty
- Fuel injector leaks
- Spark plugs may be faulty
- Improper ignition timing
- Engine Control Module (ECM) Tech notes As the code description implies the P0430 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases the catalytic convert needs to be replaced to fix the problem. If the P0430 code is combined with other codes, try fixing the other codes first.

Mar 14, 2015 | 2010 Ford F-150

1 Answer

What does a diagnostic tool mean when saying "bank 1"...

It usually means the catalytic converter is not getting hot enough to function, but could be another issue. The sensor readings between the sensor before and the sensor after the cat are not within spec.
Bank one is the side with cylinder one, or the side with the catalytic converter.

Jul 25, 2014 | 2003 Buick Regal LS

1 Answer

Po430 trouble code

P0430 - Catalyst System Efficiency Below Threshold Bank 2. The most common cause it the three way catalyst converter Bank 2. Common Problems That Trigger the P0430 Code

Feb 19, 2012 | 2005 Dodge Ram 1500

2 Answers

What is voltaqge supposed to be at the Oxygen sensors if checking for a P0430 code?

the P0430 code is the driver's side catalytic convertor is below efficiency. the voltage on the O2 sensor past the convertor should read between .400 to .700 mv when the engine is warm if the convertor is good. if the voltage makes a sweep from .050 to .950 mv then the convertor is bad.

Aug 12, 2011 | Lincoln LS Cars & Trucks

2 Answers

I have a code P0430 on a Lincoln after changings all coils on a 2004 Lincoln V6, what caused and How do I fix it?

P0430 is Catalyst System Efficiency Below Threshold (Bank 2).

A code P0430 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

First, 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 sensor while you're at it.

Aug 07, 2011 | 2004 Lincoln LS

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

1997 lincoln town car 4.6 with a p0430 fault code

I will make an assumption here, we know what the root word means. This code was extracted from the computer by? What this is telling you one of 2 things: The Bank 2 oxygen sensor down stream of the catalytic converter (there are 2 converters, one for each bank of cylinders on the 4.6ltr engine) is bad and/or that the Bank 2 catalytic converter is no longer doing the job it was designed to do. Simply, Catalysts wear out. They are good for approx 100,000 miles (as required by Federal Law). Again, I assume that the reason the intake manifold was replaced was because it had a crack in one, or more, of the runners? (part that feeds the head of a manifold). It may have taken a while to find this as being the cause of why the car running incorrectly, maybe rough. This means, that during the time the car was being driven with the problem, the amount of unburned, or not within spec exhaust gases, coming off the side of the engine affected by the intake issue was higher than normal. This out of balance level of exhaust gases were being dumped into the converter on that side of the engine, thus causing the converter to have to run hotter, work harder, or even at the time the gas was being processed through, causing deposits to be formed in the converter, thus shortening it's life span. The Bank 1 side of the engine, apparently, did not have the issue and it's catalytic converter's life was not affected. I hope this makes sense to you.

Jun 21, 2009 | 1996 Lincoln Town Car

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