Common Causes, CEL 420 Code
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Joined: Jul 2006
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Common Causes, CEL 420 Code
Hi Folks,
I just bought a '96 F-150 with the 300 I-6 with a 5-speed trans. It has 137,000 miles.
I'm getting a 420 code from the computer, which translates to:
Catalyst System Efficiency Below Threshold (Bank 1)
Before I go out and steal someone's cat, what are the most common causes for this code. (I've yet to do a tune up, plugs may be 2+ years old, according to notes I found in the OM)
I just bought a '96 F-150 with the 300 I-6 with a 5-speed trans. It has 137,000 miles.
I'm getting a 420 code from the computer, which translates to:
Catalyst System Efficiency Below Threshold (Bank 1)
Before I go out and steal someone's cat, what are the most common causes for this code. (I've yet to do a tune up, plugs may be 2+ years old, according to notes I found in the OM)
Postmaster
Joined: May 2002
Posts: 3,241
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From: Broken Arrow, OK
There are no common causes, there is only one cause: a bad cat. In order for this code to set both O2 sensors must be working properly, so they can be rules out unless they have both failed and are both reading the same voltage.
Elder User
Joined: Nov 2005
Posts: 575
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Originally Posted by 83Van
Code 420 = a bad cat? Hrmm... wonder if that's a little joke by some engineer telling you it's smoking too much ;-)
[sorry, couldn't resist]
[sorry, couldn't resist]
x1000IDK why, but that is the funniest thing I have heard/ read in a good long while.
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