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P0420 suzuki Hi, I have a Suzuki Reno 2005 and I failed to pass the emission test. My car is getting a code P0420 but my check engine light is not on, however the light works normally when I turn on the car or If a pass the switch. My question is: why the light is not on, and is it the sensors or catalyst converter? I already replace the O2 sensor and I friend told me to add a seafoam in the gas tank, and already did it. Somebody knows what I should do next? I don't want spend money in stupid way. Thanks for your help

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  • Cars & Trucks Master
  • 8,589 Answers

This code indicates your catalytic converter has worn out. Check the numbers from the emission test to verify you exceeded hydrocarbon limits. If yes, replace the converter. Not sure why the light is not coming on. Could be a bad connection between the computer and the instrument panel.You would have to troubleshoot the computer connector to find the problem.

Posted on May 18, 2017

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Posted on Jan 02, 2017

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SOURCE: 1999 Honda Odyssey p0420 Error Code

Cat efficentcy. replace the converter.

Posted on Jul 07, 2009

CMV9
  • 594 Answers

SOURCE: Pulled code p0420 on 99 chevy astro, 2wd, v6

from what i am finding the code means o2 sensors. they recommend replacing them and if this does not work than replacing the cat converter

The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.

causes

A code P0420 may mean that one or more of the following has happened:

  • Leaded fuel was used where unleaded was called for
  • An oxygen sensor is not reading (functioning) properly
  • The engine coolant temperature sensor is not working properly
  • Damaged or leaking exhaust manifold / catalytic converter / exhaust pipe
  • Retarded spark timing
  • The oxygen sensors in front and behind the converter are reporting too similar of readings
possible soloutions

Some suggested steps for troubleshooting a P0420 code include:
  • Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required.
  • Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
  • Inspect the downstream heated oxygen sensor (HO2), replace if necessary
  • Replace the catalytic converter
One thing to note is that many vehicle manufacturers offer a longer warranty on emissions-related parts. So if you have a newer car but it's out of it's bumper-to-bumper warranty, there still may be warranty on this type of problem. Many manufacturers give a five year, unlimited mileage warranty on these items. It's worth checking into.


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Posted on Aug 20, 2009

  • 67 Answers

SOURCE: 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...

Posted on Feb 19, 2010

techbuster
  • 5081 Answers

SOURCE: FAILED EMISSIONS TEST P0401&P0420 CHECK

P0401 indicates that the Exhaust Gas Recirculation Flow Insufficient Detected. This can be because EGR is faulty . As you have replaced this then the problem must be with the vacuum line . EGR valve vacuum line which can be broken or blocked. The vacumn ine must bbe checked for leaks or any blocks using an vacumn pump connected the line.

P0420 indicates that the down stream oxygen sensor reading is not steady and it is connected with the code P0401.

Posted on Jan 05, 2011

bluebirdmate
  • 1190 Answers

SOURCE: 2001 Toyota Camry - check engine light on - code

Hello: Code 420 normally indicates a catalytic converter is operating below 60% efficiency. You need to take your car to another shop and request a COMPLETE diagnosis not a dart board guess.

Posted on Sep 13, 2011

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    Tip

    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.

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    press the helpful button
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    Read more at: http://www.obd-codes.com/p0447
    Copyright OBD-Codes.com

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    http://www.obd-codes.com/trouble_codes

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