Check Engine Light Clears Itself?
Thread Starter
Member
Joined: Nov 2008
Posts: 216
Likes: 1
From: Colorado Springs, CO
Year: 1998
Model: Cherokee
Engine: 4.0HO
Check Engine Light Clears Itself?
Is it normal for a CEL to just go away? I was showing a P0420 code for about a week and then it just went away in its own. I didn't do anything to it. Is this normal? Or is it a sign of a worse/bigger problem?
Seasoned Member
Joined: Nov 2009
Posts: 421
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From: Rio Rancho NM
Year: 1996
Model: Cherokee
Engine: 4.0
yes it does, if the condition that caused it to trigger is intermittent and stops after a few service cycles the light goes out, the code will remain stored.
CF Veteran
Joined: Nov 2010
Posts: 5,841
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From: In the middle of Minnesota!
Year: 1999
Model: Cherokee
Engine: 4.0
As mentioned, the fact that the light is going on and off indicates that you are marginal on the signals that trigger this light.
P0420 is a catalytic converter efficiency code. It could mean that your catalytic converter is failing or it could be a failure of the after cat oxygen sensor itself.
P0420 is a catalytic converter efficiency code. It could mean that your catalytic converter is failing or it could be a failure of the after cat oxygen sensor itself.
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