Question about 2003 Dodge Neon

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P-0420 - 2003 Dodge Neon

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INDIRA KUMAR

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The definition of code P0420 Is Catalyst Efficiency. You may have an oxygen sensor problem or a catalytic converter problem. Your vehicle has 2 oxygen sensors. Check your oxygen sensors.If they are then you may need a catalytic converter. Depending on your mileage it may be covered under a Dodge emissions warranty. Have it checked by a certified garage first and in the meantime contact your local Dodge dealer and find out the emissions warranty most are 8 yr or 80,000 miles.

Posted on May 20, 2010

  • INDIRA KUMAR
    INDIRA KUMAR May 20, 2010

    Dodge Neon has a 5 year 50,000 mile warranty on emissions!

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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


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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

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1 Answer

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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.

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1 Answer

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


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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.

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1 Answer

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

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replace catilytic converter

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what is catalyst efficiency below threshold ( bank 1 ) mean?

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2 Answers

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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

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