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Posted on Sep 28, 2009
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P 0421 code when took emissions test - 2003 Mitsubishi Diamante

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  • Master 1,986 Answers
  • Posted on Sep 28, 2009
Anonymous
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Joined: Aug 07, 2009
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Either your O2 Sensor has failed, your catalytic converter has failed, or one of your spark plugs is fouled up

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