Question about 2003 Hyundai Santa Fe
Can a leak on the manifold cause this
P0420 is a catalytic converter inefficiency code. The most likely problem is the catalytic converter is no longer able to function. The cat is monitored by the downstream O2 sensor. Unless there was a leak near that sensor than its unlikely (but not impossible) that an exhaust manifold leak is causing the problem.
What is possible is that the leaking exhaust manifold is skewing the readings for the upstream O2 sensors which could effect the life of the cat if the vehicle is running slightly richer than it should be.
Posted on Feb 24, 2012
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Jun 05, 2014 | 2001 Volkswagen Jetta TDI
Catalyst System Bank 1 Low Efficiency
Air leaks at the exhaust manifold or in the exhaust pipesBase engine problems (i.e., high engine oil or coolant usage).Catalytic converter is damaged, contaminated or has failed.Continuous engine misfire conditions, or weak or low coil output.Front HO2S or rear HO2S is contaminated with fuel or moisture.Rear HO2S is loose in the mounting hole (check it for a leak).Front HO2S older (aged) than the rear HO2S (HO2S-12 is lazy).Click here to see.
Jan 16, 2013 | 2005 Buick LeSabre
Apr 24, 2011 | 2005 Toyota Highlander
Feb 25, 2011 | 2005 Isuzu Ascender
Nov 16, 2009 | 2003 Ford Escape
Apr 20, 2009 | 2003 Toyota Camry
Apr 04, 2009 | 2001 Chevrolet Impala
Mar 24, 2009 | Chrysler Concorde Cars & Trucks
Mar 11, 2009 | 1996 Ford Windstar
Nov 23, 2016 | 2003 Hyundai Santa Fe
443 people viewed this question
Usually answered in minutes!