P0420 code ????
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P0420 code ????
I have a 2011 F350 CC long box 4x4, with a 6.2, 93,000 km on it.
I periodically get a P0420. I clear it and sometimes it comes back in 10 or 20 KM and sometimes it comes back in a couple hundred km. Been doing this for about 800 KM.
Yesterday I got an exaust leak at the joint where the exaust manifold meets the pipe beside the engine. Checked close, bolts appear intact, leak is on the outboard side blowing towards the frame. Looks like a gasket or donut seal failed.
I am wondering if the catalytic converter was plugged or restrictive, would this cause the P0420 and could back pressure from a restricted catalyitic converter cause the gasket to blow?
Thanks for any input
edit for spelling
I periodically get a P0420. I clear it and sometimes it comes back in 10 or 20 KM and sometimes it comes back in a couple hundred km. Been doing this for about 800 KM.
Yesterday I got an exaust leak at the joint where the exaust manifold meets the pipe beside the engine. Checked close, bolts appear intact, leak is on the outboard side blowing towards the frame. Looks like a gasket or donut seal failed.
I am wondering if the catalytic converter was plugged or restrictive, would this cause the P0420 and could back pressure from a restricted catalyitic converter cause the gasket to blow?
Thanks for any input
edit for spelling
Last edited by StewB; May 30, 2015 at 04:09 PM. Reason: wrong code in title
Super Moderator
Joined: Aug 2008
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From: Frederick, MD
Catalyst System Efficiency Below Threshold (Bank 1)
That is what the codes means. I would fix the known leak, clear the code and see what you get. Makes sense given what you have found.
That is what the codes means. I would fix the known leak, clear the code and see what you get. Makes sense given what you have found.
Elder User
Joined: Jan 2002
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The leak that you described can cause the P0420 code. First, fix the leak and clear the code. Then, if the code comes back, you need to look farther. Could be a bad 02 sensor, could be bad cat, could be wiring to 02 sensor, etc., but the code is probably being caused by the leak.
Hotshot
Joined: Jan 2004
Posts: 19,762
Likes: 1,079
From: St Louis
Close, but it's more complicated than that.
Download a copy of the OBDII Theory from Motorcraft Technical Resource to learn more.
Download a copy of the OBDII Theory from Motorcraft Technical Resource to learn more.
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