Dreaded P0420 code.... - Hyundai Forums : Hyundai Forum
Reply
 
LinkBack Thread Tools
post #1 of 26 (permalink) Old 02-16-2017, 06:15 PM Thread Starter
Member
 
Wkd drgn's Avatar
 
Join Date: Jul 2015
Drives 2013 Hyundai Accent SE
Posts: 90
Mentioned: 1 Post(s)
Quoted: 21 Post(s)
Wkd drgn is an unknown quantity at this point
(Thread Starter)
Dreaded P0420 code....

Me and my husband were driving home from Discount Tire and he was saying, "You got rid of the Honda because you got tired of dumping so much money into it..." and before he finished the sentence I stopped him and said the engine check light came on. This hyundai has replaced a 2000 Honda Civic EX. Now I got the code reader and read the code. P0420. I had this code with the Honda before and the fix was an OEM catalytic converter. That was around $750. The Accent has about 93,xxx miles now and I am wondering what is the fix for this one? There was no recommended fixes provided on the reader...
Wkd drgn is offline  
Sponsored Links
Advertisement
 
post #2 of 26 (permalink) Old 02-16-2017, 06:54 PM
Senior Member
 
Join Date: Jun 2011
Posts: 628
Mentioned: 3 Post(s)
Quoted: 79 Post(s)
jsvob03 is an unknown quantity at this point
You're on the right track ,the p0420 (or 430) is fairly straight forward to diiagnose. You might have some warranty remaining on the convertor if you happen to have a California emissions vehicle (in a California emissions state).
jsvob03 is offline  
post #3 of 26 (permalink) Old 02-16-2017, 07:19 PM
Senior Member
 
NicholasD's Avatar
 
Join Date: Jul 2016
Location: Central Wisconsin
2017 Hyundai Elantra Limited 1988 Toyota Supra Turbo 1982 Pace Arrow Motorhome 1986 Bayliner, Vol
Posts: 1,253
Mentioned: 94 Post(s)
Quoted: 539 Post(s)
NicholasD is an unknown quantity at this point
Ever since the newly formed EPA mandated this after the fact emission control device in model year 1972, the catalytic converter, been cleaning my spark plugs every 15 K miles with a walnut sandblaster, also gap them in the 25-30 mil range to prevent msifire, dumped in a can os Seafoam every 5K miles to remove carbon build up on the rings and only used so-called to tier gas. Haven''t had to replace a cat yet, with even over 220 K miles on a vehicle.


Also was part of that committee of engineers that address congress in around 74 or 75 attempting to lesson or remove carbon from the fuel, the main problems with HC's, CO, and now CO2, that was a worthless battle with an oil controlled congress, this has been going on for 45 years now, SOS, same old stuff.

Cat can be tested for blockage by removing the front O2 sensor with an adapter to put a pressure gauge on it, typically at the 2 psi range at idle, if plugged, no choice but to replace it. On some used vehicles, just replaced it myself with an aftermarket unit, kids going to school, never was that rich to buy them a new one. Neighbor was, only had one kid.

Added that second O2 sensor for secondary testing, can also be the problem. Also been attempting to develop a catalytic converter for over 40 years now to reduce NOx emissions, no success yet, already proven lean burn engines can be far more fuel efficient but do generate NOx's. Until then, we will be burning a lot more fuel.

Now name me just one vehicle, passenger type made in the USA since 1972 that didn't have this problem. EPA was very slow in commercial vehicles puffing out black diesel fuel, at any time least over 10,000 airliners in the sky, don't touch these either, definitely not NASA nor the military, but watch our if you are driving a 1.4L car.

Carbon is the problem, also why you have to change your oil every five minutes.
NicholasD is offline  
 
post #4 of 26 (permalink) Old 02-16-2017, 07:21 PM
Senior Member
 
Join Date: Sep 2015
Location: Albany/NY/USA
Drives 2001 Elantra GLS 2.0L Auto
Posts: 1,225
Mentioned: 6 Post(s)
Quoted: 243 Post(s)
avisitor is an unknown quantity at this point
Sometimes the O2 sensor after the cat is not working properly and will throw off the actual efficiency
Have seen people change the O2 sensor or even wash the cat with lacquer thinner ...
Or replace MAF or MAP sensor or tune up, etc

There is more on youtube about how to treat this issue without spending too much
Don't know if they work.
avisitor is offline  
post #5 of 26 (permalink) Old 02-16-2017, 07:45 PM Thread Starter
Member
 
Wkd drgn's Avatar
 
Join Date: Jul 2015
Drives 2013 Hyundai Accent SE
Posts: 90
Mentioned: 1 Post(s)
Quoted: 21 Post(s)
Wkd drgn is an unknown quantity at this point
(Thread Starter)
Nope, Virginia Resident here.
Wkd drgn is offline  
post #6 of 26 (permalink) Old 02-16-2017, 08:06 PM Thread Starter
Member
 
Wkd drgn's Avatar
 
Join Date: Jul 2015
Drives 2013 Hyundai Accent SE
Posts: 90
Mentioned: 1 Post(s)
Quoted: 21 Post(s)
Wkd drgn is an unknown quantity at this point
(Thread Starter)
I got the blue driver code reader was going to go try the o2 sensor graphs but am gonna save it for tomorrow. I had a Guinea pig give birth to some babies today, on top of a lot of errands I ran, I'm exhausted for so much.

Sent from my SM-G920V using Tapatalk
Wkd drgn is offline  
post #7 of 26 (permalink) Old 02-16-2017, 11:02 PM
Senior Member
 
Join Date: Sep 2015
Location: Albany/NY/USA
Drives 2001 Elantra GLS 2.0L Auto
Posts: 1,225
Mentioned: 6 Post(s)
Quoted: 243 Post(s)
avisitor is an unknown quantity at this point
Quote:
Originally Posted by jsvob03 View Post
You're on the right track ,the p0420 (or 430) is fairly straight forward to diiagnose. You might have some warranty remaining on the convertor if you happen to have a California emissions vehicle (in a California emissions state).
Quote:
Originally Posted by Wkd drgn View Post
Nope, Virginia Resident here.
Cars can have a federal emissions regulation or cars can have a California emissions regulation
The label to indicate this can be found usually on the hood of the car
If you have a federal emissions catalytic converter then it can be replaced by almost any catalytic converter
If you have a California emissions catalytic converter then it has to be a CARB compliant catalytic converter
And registered when installed by a licensed mechanic or shop

Some states other than California require the newer cars to be CARB (California Air Resources Board) compliant
avisitor is offline  
post #8 of 26 (permalink) Old 02-17-2017, 07:53 AM Thread Starter
Member
 
Wkd drgn's Avatar
 
Join Date: Jul 2015
Drives 2013 Hyundai Accent SE
Posts: 90
Mentioned: 1 Post(s)
Quoted: 21 Post(s)
Wkd drgn is an unknown quantity at this point
(Thread Starter)
I'm not sure if it is or isn't. I'd say by looking at the label it is? Here's the label


As for the diagnosis I ran the reader again and it said all the 02 sensors passed it was the catalyst monitor test that failed. Also my dad just told me I have to wait for the car to be at operating temperature to do the test. Which I didn't so I'm about to head back out there.

The spark plugs were replaced not too long ago maybe a few months, with OEM ones from the dealer and I checked the gaps before putting them in. It just seems quick for this to go bad.

Sent from my SM-G920V using Tapatalk
Wkd drgn is offline  
post #9 of 26 (permalink) Old 02-17-2017, 08:37 AM Thread Starter
Member
 
Wkd drgn's Avatar
 
Join Date: Jul 2015
Drives 2013 Hyundai Accent SE
Posts: 90
Mentioned: 1 Post(s)
Quoted: 21 Post(s)
Wkd drgn is an unknown quantity at this point
(Thread Starter)
Okay so I am thinking this one is NOT California emissions, my question that I've been trying to ask is if it turns out that I need to replace the converter, will it be like how the Honda Civic was. The Honda wouldn't work with aftermarket converters. I had to put OEM on it, believe me, I tried. Are Hyundais the same? Or can you use aftermarket with no issue?

Sent from my SM-G920V using Tapatalk
Wkd drgn is offline  
post #10 of 26 (permalink) Old 02-17-2017, 08:51 AM
Senior Member
 
solman98's Avatar
 
Join Date: Apr 2015
Location: Dallas GA
Drives 2014 Elantra Sport 2.0 6M 2016 Tucson Sport 1.6T
Posts: 1,955
Mentioned: 19 Post(s)
Quoted: 591 Post(s)
solman98 is an unknown quantity at this point
Garage
Might be an odd question, but you have one or two cats?


Quick search shows multiple options for a 2013 Hyundai Accent SE. Some are attached to the manifold and some look to be inline. I'd take a good visual and go from there. Cats are easy to replace, but not always easy to get to.


An aftermarket should work, as Hyundai or Honda doesn't actually make theirs. Make sure it's for the model (might be what happened with your Honda). Don't buy universal.

2014 Elantra Sport 2.0 6M Shimmering Silver. LED interior lights, cargo mat and net. 35/20% tint. LED tag and back up lights. LED fogs. LED headlights, homelink.
2016 Tucson Sport 1.6T 7A Caribbean Blue. Hitch, tint, mudguards, homelink, cargo cover, LED back up and tag lights, power pass seat lumbar installed, LED fogs, aftermarket crossbars for the roof.
solman98 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Hyundai Forums : Hyundai Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome