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I have a 2005 Hyundai Elantra with 2 codes both are PO420 . What could it be?

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  • Cars & Trucks Master
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Code 420 is for a problem with the catalytic converter. The computer uses the O2 sensors in front of and after the cat to monitor its activity.
The problem could be one of the sensors, or the cat. The system would need to be checked out to find the actual problem.

Posted on May 02, 2013

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Posted on Jan 02, 2017

jmeyer847
  • 185 Answers

SOURCE: PO420 code for 2003 Elantra

Danny,

Catalytic Converter Failure is a common cause of a P0420 Code. 1.) I would give a few calls to some muffler shops and get a thorough exhaust inspection done. As a leaking/damaged Exhaust Manifold, Catalytic Converter, or exhaust pipe could be some of the culprits as well. If it were any of those other items your car would give you a different OBD Code. Item #2.) This is not common with a P0420 Code. With the P0420 code you should have no driveability issues. (not to say that you wouldnt in an extreme rarety) Item #3.) Again this would flag an entirely different code such as P0455 (Large Evap Emission Leak) Item#4.) Engine Oil would not even set a code. I hope this helps you out, and thank you for using FixYa!

Sincerely,

JC

Posted on Nov 19, 2008

ecmurphy10
  • 53 Answers

SOURCE: oil change procedure on a 2005 Hyundai elantra

This one is simple

1. Remove dip stick and filler cap.
2. Remove oil plug from oil pan and drain oil into an appropriate pan.
3. Remove and replace oil filter. (Filter will drain oil, just be aware to try and get it into the pan.
4. Refill oil. Start with 3.5 quarts, put cap and dip stick back on and start car, wait about 10 seconds and then turn off.
5. Check your dipstick for proper oil level.

And thats it you are done.

Posted on Jan 20, 2009

  • 115 Answers

SOURCE: P0139 code for a 2003 hyundai elantra. What is this code?

Hi the code P0139 is Bank 1 sensor 2 lambda sensor fault ,possible wiring or sensor fault even if you replace the sensor you need to have the MIL lamp turned off by a Diagnostic machine,it is possible you have another fault such as poor Catalytic converter efficency giving the same fault code ,Would recomend you get the car checked and read the "live" data as the car see`s it to make an accurate diagnosis and cure

Posted on Jul 10, 2009

  • 184 Answers

SOURCE: 2003 Hyundai Elantra GLS. Check engine light, code PO133

Did you use a aftermarket O2 sensor or a genuine Hyundai one? If it's an aftermarket one it may be bad or not as good as the OEM one. See here for more details and other potential causes: P0133

Posted on Feb 11, 2010

ZJLimited
  • 17970 Answers

SOURCE: need fil for error code P2626 Hyundai Elantra GLS

P2626 O2 Sensor Pumping Current Trim Circuit/Open (Bank 1 Sensor 1)

I'll sure this has to do with a faulty O2 sensor. This sensor is usually located around the header of your car, or down more on your exhaust.

Try disconnecting your battery for 30 mins, hook it back up, and start your car again. This will erase the error. See if it comes in again.

Hope this help (remember rated this post).

Posted on Mar 25, 2010

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1 Answer

Bad catalytic converter symptoms


First is a PO420 or PO430 obd2 code

Converters should last 12 to 14 years

Next --if it has completely failed & melted the
honeycomb inside,then it is blocked & you go
about 30 mph at best

A clogged gas filter will do the same & get you
to about 50mph

You should not have a converter issue on a 2008 vehicle

Want to provide more info?

Dec 01, 2012 | 2008 Hyundai Elantra

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Need fil for error code P2626 Hyundai Elantra GLS


P2626 O2 Sensor Pumping Current Trim Circuit/Open (Bank 1 Sensor 1)

I'll sure this has to do with a faulty O2 sensor. This sensor is usually located around the header of your car, or down more on your exhaust.

Try disconnecting your battery for 30 mins, hook it back up, and start your car again. This will erase the error. See if it comes in again.

Hope this help (remember rated this post).

Mar 25, 2010 | 2005 Hyundai Elantra

1 Answer

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ask what spark plugs they put in your car. bosch platinums and other aftermarket plugs will give you these symptons. stick to the ngk or champions that came stock

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