Best Answer

This engine code can be triggered by any one of the following:

1.) The catalyst in the catalytic converter is cracked, clogged, or otherwise damaged.

2.) The secondary O2 sensor is malfunctioning.

3.) There is an exhaust leak.

4.) The computer unit is faulty.

2007-11-06 21:07:44
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Q: Engine light on code P0420 catalyst effientcy below threshold changed both 02 sensors cause and how to correct car still runs great and no smell?
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Related Questions

Do catalyst speed up a chemical reaction but not changed by them?

Yes, that is correct.

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The correct answer is a simple one: The system is unaffected by a catalyst in a system in equilibrium.

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The correct answer is World War II.

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That is the correct spelling of "influenced" (affected, changed).

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a statute can only be changed by parliament. A charter can be changed by tha government. Is this correct?

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It wasn't changed. Pyjamas is the correct spelling of Pajamas in Europe.

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The correct spelling is difference (a distinction, or something changed).

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Yes, that's correct.

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The correct spelling is disguised (changed in appearance, as to avoid recognition).

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It taught people correct grammar.

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You must correct what is wrong with it before it will work.

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This affirmation is not correct in chemistry.