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P0421 code on recently purchased(from dealer) 2002 RS

Have a 2002 Eclipse RS which I just bought from a dealer...The "service engine soon" light came on...OBDII code P0421, and a P0421 pending. Cleared the codes and it went about 6 days before reappearing...appeared on cold days both times. 112,000 miles, any reason to worry imnediately?

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  • Anonymous Mar 18, 2014

    Code p0421 ,p0156,p0154,p0161

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  • 14 Answers

Hi,

So you have a P0421.

A 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

As far as running conditions if it performs normally, you most likely need a catalytic converter. The good part of this is there shouldn't be any abnormal running conditions, so it should be fine unless the engine is running very rich for some reason. (it will usually smell badly when this happens) However, on rare occasions the cat can get hot and melt down causing an exhaust restriction..bad gas mileage, low power, and possible fire potential, but most likely this is not the case. (this is generally speaking here and covering all the bases... )

The most common thing with P0421 that the fuel injection computer detects that the cat is not performing to federal specs an need to be replaced. You will need to have it fixed before your vehicle inspection.
Good luck and I hoped this helped you.

Posted on Dec 27, 2008

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Posted on Jan 02, 2017

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