Question about Mitsubishi Eclipse

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My son has a 2002 GS, and from time to time the check engine light comes on and the last time they fixed one of the catalytic converter sensors and all was well. Tonight the engine starting bumping like crazy again and the check engine light is on. I drove it a bit and looked underneath and a pipe running into the engine was orane red hot, it enters into a silver device under the oil area. Not sure what this pipe(muffler looking) but when I turned the engine off the orange hot color went away.

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Sounds like there might be something inside of your exhaust creating pressure making your pipes hot. You might need a new Catalytic Converter. Dont wait too long to check this out, because if you do need a new Catalytic converter, your exhaust Manifold MAY Melt to your Head because of the heat.

Posted on Nov 30, 2008

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PO420


Not just a faulty catalytic converter will trigger this code. Many other issues can trigger this code.

  • Leaded fuel was used where unleaded was called for
  • An oxygen sensor is not reading (functioning) properly
  • The engine coolant temperature sensor is not working properly
  • Damaged or leaking exhaust manifold / catalytic converter / exhaust pipe
  • Delayed spark timing
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Possible solutions:
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  • Replace Coolant Temperature Sensor
  • Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
  • Inspect the downstream heated oxygen sensor (HO2)
  • Replace the catalytic converter
  • Have timing adjusted


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