Question about 2000 Honda Civic

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I have a engine light Code P 0420, please tell me how to fix this & what is this. Its 2000 Honda Civic Ex $ door Sedan

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Your Honda is probably very high on mileage. The P0420 code indicates that the catalyst system is operating below the efficiency threshold. In English, your sensors are telling your ECU that the catalyst in the catalytic converter is worn out. A new catalytic converter is going to be big $$$.

It is not going to disable your car, but if you live in a state requiring emission testing to pass inspection, your car will probably not pass the next inspection.

You can get a code reader (the Actron CP9575 or CP9175; both work well for less than $150.00 USD) from most auto parts stores or Sears and try clearing the code. In all liklihood, clearing the code this way will not fix the problem and the CEL will illuminate again.

Posted on Jul 22, 2010

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Posted on Jan 02, 2017

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