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Honda Civic / Del Sol (1992 - 2000) EG/EH/EJ/EK/EM1 Discussion

engine code P420

Old 05-31-2006, 09:56 PM
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Default engine code P420

anyone gotten this code before? i got a 98 civic EX with only 60,000 miles. i have already replace upper and lower o2 sensor.it gone away for a few months but is back again,so whats next the cat? and if so,what is the most common problem that would kill the cat?
thanks
Old 05-31-2006, 09:59 PM
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I think that's primary 02.
Old 05-31-2006, 10:00 PM
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Default Re: engine code P420 (ironryder)

if you run rich, then that will blow your cat
Old 06-03-2006, 07:39 PM
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can dirty injector cause you to run rich?
Old 06-03-2006, 08:06 PM
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Default Re: (ironryder)

We see this all the time at work. That codes means that the cat. is no longer efficent. You need to replace your cat. then clear the code.
Old 06-03-2006, 09:06 PM
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Default Re: (LVB18Civic)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LVB18Civic &raquo;</TD></TR><TR><TD CLASS="quote">We see this all the time at work. That codes means that the cat. is no longer efficent. You need to replace your cat. then clear the code.</TD></TR></TABLE>

second this
Old 06-03-2006, 09:09 PM
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Default Re: (LVB18Civic)

i third this same thing happen to my friend and we put a carsound cat on and it went away after we cleared the code
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