Question about 2006 Pontiac G6

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Showing codes p0010-p0011-13-14-p0054-p0304-p0420

Wont pass emissions

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Posted on Jan 02, 2017

SOURCE: 2005 Chrysler 300 OEM Number to Cross: P0420 check engine light is on need to pass emissions test what is wrong?

If you google OBD2 PO420 you will see that you
have a failed exhaust converter on bank #1 side of
the motor

Seeing as how they last 12 to 14 years & yours only
8 years, you have had class A cylinder misfires, most likely
for years & that ruined the converter

Also a leaking fuel injector or anything causing a rich fuel
condition will ruin it

I suspect you seldom go to a repair shop until you have to,
& I also fault those shops as to not checking a thing, & it is now
costing you unnecessary repairs & your lucky you haven't done
more engine damage over the years

I also expect you have no idea that spark plugs get changed
every 3 years
Oxygen Sensors at 100,000 miles

Unrelated-brake fluid every 2 years,trans & power steering
every 3 years & much more preventative maintenance

Simply-- the auto profession let you down,you assumed
they actually have your cars best interests in mind.

They don't

Lack of knowledge is responsible for a preventable
situation you now have

Posted on Mar 02, 2013

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I have two codes come up when checking why my check engine light is on. P0447 and P0420. Any info on what these mean and what it takes to fix so I can pass my smog test??


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Definition of P0420 is catalyst below threshold. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). Catalytic converters are not normally a "wear" type item, that is they are not deisgned to wear out and need replacement. If they have failed, it is likely due to something else that caused it to fail.

P0447 Evaporative Emission Control System Vent Valve/Solenoid Circuit Open. The Powertrain Control Module (PCM) has detected an open within the circuit that controls the vent valve or solenoid for evaporative emission systems vapor.

Read more at: http://www.obd-codes.com/p0447
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Jan 26, 2016 | Hyundai Motor 2002 Elantra

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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

1 Answer

How do I pass emissions with my 1997 does explorer XLT P0


The recommended repair for both the P0171 and P0174 codes is to clean the MAF sensor. Ensure you use the proper cleaning solution, as there are many that will damage the sensor. Buy a cleaner that is made specifically for MAF sensors. The P0420 code will probably clear up if the MAF sensor clears the other two codes.

Nov 13, 2015 | 1997 Ford Explorer AWD

2 Answers

What can i do to fix p0420 & p0430 code.. 2005 ford expedition 5.4 ,,,, can you please tell me where is located p0010 code, A camshaft position actuator circuit/open bank 1... Same truck .. Thank you


p0420 and p0430 both indicate a clogged catalytic converter. 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. The p0010 indicates camshaft sensor. The camshaft sensor may be the main problem, as it will affect your timing and fuel/air ratio, which in turn can effect what your Oxygen sensors detect, throwing the p0420 and p0430.

Make sure your car is timed correctly by the timing chain/belt, reset light, then if it dont' solve the problem, change oxygen sensors, if those don't help, catalytic converter is clogged.

Dec 10, 2013 | Cars & Trucks

1 Answer

I had my car put on a machine he told me codeP300, P0171, P0302, P0304, P0420 needs repairing. What are these codes for. My car is an 2001 toyota Corolla


P0171 is a lean oxygen sensor code. Codes P0300, P0302 and P0304 are all cylinder misfire codes. Low fuel pressure can cause all of these codes and would be the first thing I would check before replacing anything. Lean codes can be caused by misfiring cylinders. Engines running lean can cause misfires. So you have to figure out which came first - the lean condition or the misfire. Also, it needs to be verified that the engine actually is running lean and the oxygen sensor is not "lying" to the computer. An oxygen sensor that is a liar can actually cause the engine to run rich while telling the computer that it is running lean...AND THIS can cause misfires.

P0420 Is an evaporative emissions system leak code. This code is most often caused by a bad or loose fuel cap. It is also often caused by people refueling their vehicles with the engine running. It can also be caused by a leak in the system that has nothing to do with the fuel cap or refueling.

Evaporative Emissions Vent Solenoid failures are very common on Toyotas and can also cause P0420.

So, to wrap all of this up in simple terms:
You need to get some diagnostics done to save you from wasting a bunch of your hard-earned cash trying to guess what to do to fix the car.

May 02, 2011 | Toyota Corolla Cars & Trucks

1 Answer

2004 Dodge Ram P0420 code. What could be causing this? My emissions are clean (all were within limits), and I just replaced all 4 oxygen sensors


This code is set when the catalytic converters are operating below tolerable efficiency limits. Basically, your catalytic converters are bad and are in need of replacement. You can have bad converters and still pass emissions, but your computer uses the oxygen sensors to determine how well they are working. If the readings are out of a set tolerance, the check engine light will illuminate and DTC P0420 will set. Clearing the code will turn the light out temporarily, but the next time the test is run, the light will come on again.
Hope this helps.

Oct 20, 2010 | 2004 Dodge Ram 1500

1 Answer

2001 Honda - New Catalytics & O2 sensors -- new 0420/1739/1456


I would send the car for a smoke test for the emissions leak...Find out where the leak is comming from..Repair it..Reset the codes, then do a drive cycle and see what happens...

Jun 29, 2009 | 2001 Honda Odyssey

1 Answer

Error codes: P0420 AND P0446


the p0420 could and usaully is a bad converter.

May 28, 2009 | 1996 Oldsmobile Bravada

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