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2006 mustang gt obd code p0430. Catalytic converter below minimu threshold. Could this be a bad cat O2 sensor or does it always mean the converter is bad?

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Posted on Jan 02, 2017

rockitman187
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SOURCE: Code P0430 Catalyst Efficiency below threshold (bank 2)

one of your O2 sensors is showing as bad.

Posted on May 11, 2009

  • 5 Answers

SOURCE: 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.

Posted on Aug 19, 2009

  • 225 Answers

SOURCE: 2004 Toyota Sienna code P0430, Catalyst system

7 out of 10 times that means that one of the cat's have gone bad. Most of the time it happens when your mileage is around 100,000 miles. The only thing is to do is to change the bad cat.

Posted on Aug 30, 2009

  • 7353 Answers

SOURCE: Cat efficiency below threshold

the cat is bad, you will need it replaced, be sure there is no other problems that would cause the cat to go bad. IE... rich? misfiring , ect.

Posted on Oct 18, 2009

Rebgagnon
  • 382 Answers

SOURCE: 2000 Subaru Outback Wagon (100K miles) with P0420 Code

I do not know for sure if this is the problem you are having, But, I have noticed that from 95 up to 2002 I have seen a lot of PO420 codes that have been just the sensor. I do not know if it was a weak sensor or just that program telling it that it is below threshold. I did notice that if the vehicles are run for a long trip at highway speed it goes out. I wish you luck and have a great day.

Posted on Feb 11, 2010

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Car sometimes will not start after sits for a day


Definition of Diagnostic Trouble Code P0420 Category: Powertrain Definition: Catalyst System Efficiency Below Threshold Bank 1Note: This definition of P0420 is applied to all manufacturers

Definition of Diagnostic Trouble Code P0430 Category: Powertrain Definition: Catalyst System Efficiency Below Threshold Bank 2Note: This definition of P0430 is applied to all manufacturers

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.

Jul 11, 2015 | 2006 Toyota Solara

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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

2 Answers

2005 Hyundai Tucson 2.7L 2WD


P0430 is a catalyst efficiency code. If there are no leaks in the exhaust or any vacuum leaks that could affect O2 sensor operation and the O2 sensors are working properly then it's possible that you need a catalytic converter. If you have access to a scanner capable of reading live data plug it in and take the vehicle on the high way at a steady 55-60 mph. The O2 sensor should read somewhere around 700 mv give or take but should not fluctuate to much. If it does you need a catalyst bank #2. Good luck!

Apr 10, 2014 | Cars & Trucks

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

1 Answer

Drive and idle is normal but suddenly check engine, pcs and vsc light come up. mechanic have checked. they said this car have few code. p0420, p0430, c1734, b2090, c1a40


ok lets do this in order
P0420 Catalyst System Efficiency Below Threshold (Bank 1) an o2 sensor bad usually before the Cat converter P0430 Catalyst System Efficiency Below Threshold (Bank 2) same thing but the sensor after the cat converter the c1734 people will say you need to replace a bad BCM, but don't,, once the O2 sensor problem is addressed , that code will clear , it has to do with the remote start b2090 has to do with power doors ,, this will drop off too once the system is rest , same with the last one you listed, If I was you I'd have the 2 O2 sensors checked, replace the bad one, or both, and have the mechanic clear all the codes, then recheck them

Aug 11, 2011 | Lexus LS 460 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

How do I repair obd code p0430 bank 2?


P0430 means that the O2 sensor behind the catalytic converter is detecting that the catalytic converter is not functioning properly. This can be caused by a bad sensor, and exhaust leak or the actual catalytic converter is bad. Check for leaks 1st. The sensor is changed by unhooking and unscrewing it from the exhaust pipe, the catalytic will need to go to a repair shop. Hope this helps, let me know.

Aug 09, 2010 | 1996 Ford Taurus

2 Answers

Trouble codes


You mean P0420? You need a new cat converter. The "Mechanic" couldnt tell you that?

Nov 25, 2009 | 1998 Chevrolet Venture Cargo

1 Answer

Code PO42O and PO43O ? Anyone know what they


The meaning of: P0420 Catalyst System Efficiency Below Threshold on Bank 1 P0430 Catalyst System Efficiency Below Threshold on Bank 2

Basically the Oxygen sensors ( one before and one after the catalytic converter ) have abnormal readings from the exhaust. Further diagnosing will need to be done by a mechanic to find the source of the problem. The possibilities could be the O2 sensors themselves, a leak in the exhaust manifold, a bad catalytic converter, and etc.

Nov 14, 2009 | 2002 Toyota RAV4

1 Answer

2002 Hyundai Sonata code reads P0430 what does this mean Catalyst System Efficiency Below Threshold (Bank 2)


That's a pretty RELIABLE code!... You have a bad CAT (Catalytic Converter). Trust it to be accurate. The conditions which set this code is when the Upstream O2 sensor's data/signal is compared to the Downstream sensor's data/signal... when they are nearly identical, that's when this code is set (unless you have an exhaust leak).. If there is an exhaust leak.. repair it, then retest/recheck.

May 08, 2009 | Hyundai Sonata Cars & Trucks

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