Question about Cars & Trucks
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
SOURCE: PO420 code for 2003 Elantra
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!
Posted on Nov 19, 2008
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
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
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
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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