Question about 2002 Dodge Neon

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Has code 0420 - 2002 Dodge Neon

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This code indicates that the catalytic converter is not functioning properly. This could be due to a poor state of tune and the poor running engine is overloading the cat to the point where it can't control the emissions, or the cat is simply worn out and needs to be replaced.

Posted on Apr 03, 2011

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2002 neon trunk lid opens on its own, door locks, horn and door chime activate on their own. can you solve the problem

Posted on Jun 16, 2011

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Posted on Jan 02, 2017

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Po 300 Po 316 Po420 Po430 2004 Ford Taurus. The car idle high or ruff when I start it in the morning but never shut off. After I got tune up it's worse it even shut off after running for a few mins


code p 0300 refers to random /multiple cylinder/s ---misfire detected ===causes spark plug/s---HT lead/s ---injector/s --ignition coil/s ---low compression---wiring
code p 0316 refers to misfire detected during start up--first 1000 revolutions ===causes --engine mechanical fault ---wiring---ignition system---fuel system--injector/s
code p 0420 refers to cat converter system, bank 1---efficiency below threshold === causes cat converter---HO2S 2
code p 430 refers to the same problem and causes as code p 0420
Here is a news flash .
engines under the control of an engine control module (ECM) do not need you to do a tune up as it tunes the engine 60 times a minute and reports to you by fault codes when it can no longer tune up the engine

Nov 04, 2015 | Ford Cars & Trucks

1 Answer

Code P 0420


There are numerous things that can cause this code to come up.First how many miles do u have? U have to make sure there are no exhaust leaks by the down stream O2 sensor. Also have to make sure there are no fuel delivery problems or vacum leaks. If u have access to a scanner for your vehicle u will have to look at your fuel trims and make sure they are around 0% at idle and off idle. Also have to make sure your O2 sensors are working correctly. Post some more info for your vehicle and i can guide u in the right direction

Jan 10, 2013 | 2006 Chrysler Pacifica

1 Answer

Hi, my neon 2004, have the code: 0128,0551, 0420, 0622, 0517, 0563. I wanted to mention that it does not have catalyst, what could these codes mean?


A real smorgasbord!
0420 is for the cat, so scrub that one. I could not find 0517-don't know what that means. 0551 and 0128 are sensor malfunctions, or circuit malfunctions for those two sensors (P/S pressure switch, and Coolant temp. sensor). Before going after that, take heed of 0622 and 0563: 0563 is system voltage too high, 0622 is generator field "F" control circuit malfunction. You have a bad voltage regulator in your alternator-putting out too much current. Try a different alternator-it may clear up the sensor malfunctrions, too.

Nov 30, 2012 | Cars & Trucks

1 Answer

What should i do if i get a 0420 code on a 2003 ford taurus


Trouble code P0420 means: Catalyst System Efficiency Below Threshold

This is unrelated to the noise when turning sharply or the grinding when braking/brake light.

Feb 27, 2012 | 1993 Ford Taurus

1 Answer

I was wondering what the codes 0420 0430 and 0190 on a 2000 mercury cougar mean


Follow this link, scroll down the page to see the list of codes. Good Luck.
http://www.trouble-codes.com/

Sep 20, 2010 | Mercury Cougar Cars & Trucks

1 Answer

OBD 2 codes 0420 and 0510


if they are PO codes the engine is close to fail the 0510 is a closed throttle when other sensors think it should be open

Jun 07, 2010 | 2000 Nissan Frontier

3 Answers

2005 chrysler pacifica code 0420.Changed sensors and catyletic converter.(as recommended by dealership) Lasted long enough to get inspection, light came back on that evening . Been off and on (mostly on)...


Code P0420 is a catalist ineficiency code. It can be caused by a minor exhaust leak. Based on what youve already replaced. Inspect the entire system while its running to find any leaks.

Nov 24, 2009 | 2005 Chrysler Pacifica

1 Answer

1998 Chevrolet Cavalier 0420 Code


Here is something from a reference guide that we follow at my shop, hope it helps.

When diagnosing a PCM code PO420, be sure to determine the cause of the converter failure. Converters are not likely to fail without an external cause. Typical causes are: fuel pressure regulator leak, engine misfire, dirty fuel injectors, coolant consumption, etc. Also, be aware that some converters on the market will cause this code or codes due to a lack of oxygen storage capacity. A component that must be in these converters, Cerium, is required to store, then slowly release oxygen.

Mar 10, 2009 | 1998 Chevrolet Cavalier

2 Answers

Check Engine Light


Hello engelhard58
I have attached a link that can give you some of the reasons why your getting that code.I hope you able to get your answer out of that.
Mean of the code=P0420 Catalyst System Efficiency Below Threshold.
Link to site

Dec 12, 2008 | 2005 Subaru Forester

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