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Old 09-19-2010, 10:29 PM   #1
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Error code P0421

I have error code P0421 triggering my check engine light. Can anyone let me know what this means and what I need to do to fix it

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Old 09-20-2010, 03:06 AM   #2
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P0421 OBD-II Trouble Code
Technical DescriptionWarm Up Catalyst Efficiency Below Threshold (Bank 1)

What does that mean?Basically this means that the oxygen sensor downstream of the catalytic converter on bank 1 is detecting that the converter is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.


SymptomsYou will likely not notice any drivability problems, although there may be symptoms. The code may be more likely to occur after the engine has had numerous cold starts in the past 1-2 days.

CausesA code P0421 may mean that one or more of the following has happened:

*The catalytic converter is no longer functioning properly
*An oxygen sensor is not reading (functioning) properly
*A sparkplug is fouled up

My $ is on one of the last 2 (or so I would hope)

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Old 09-20-2010, 07:35 AM   #3
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Reset the light and see if the code returns, if so the vehicle will need to be tested further. You might need a new cat conv??
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Old 09-20-2010, 07:52 AM   #4
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How many miles on the Jeep? Maybe it would be covered under the 8/80 emissions warranty?
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Old 09-20-2010, 08:48 AM   #5
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it is a 2006 Unlimited Rubicon with 65,000 miles on it. I am not the original owner. ( I have had it for less than 6 months)

I have reset the code and within 200 miles it tripped again
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