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Answered 2004-09-17 00:10:15

Depends on which of the readings failed. Was it CO (carbon monoxide), HC (hydrocarbons), NOx (nitrous of oxides), or a combination of them?

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Will the GReddy Ti-C Catback Exhaust System for 06-09 Honda Civic affect my emissions reading?

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Not likely because: Code p0420 refers to a problem with your catalytic converter. The engine computer is able to test that converter by using an oxygen sensor before and after the converter. The computer can only test the converter under very specific driving conditions. If the computer determines that it is a good time to test the catalytic converter it will run the test. It compares the oxygen sensor readings in front of the converter to the readings behind the converter to see if the catalytic converter is functioning properly. If it is not functioning properly it will trigger a p0420. Sometimes if a catalytic converter is on the virge of failing it may fail one test and pass the next. This will cause your check engine light to come off and on every once in a while when the test is performed.


Is the 02 sensor connected to the vent solenoid?

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Can you eliminate the catalytic converter on a 2004 impala?

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Can your car run better without a catalytic converter?

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As far as the environment is concerned, yes. Catalytic converters are very important in regulating the amount of pollution your vehicle emits. As far as vehicle performance, removing a catalytic converter could increase horsepower and exhaust flow. Removing the converter can (and does on most) cause the computer to over-correct for the improper oxygen sensor readings. This over-correction usually causes a reduction in power, economy, and running performance. It is also highly illegal.


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Check engine light: Reading stated catalyst effeciency below threshold?

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Is there a difference between the 2 O2 sensors on the 2.5L 2002 Sentra?

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What does an O2 sensor do on a 02 Jeep Cherokee?

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odometer readings ?

where can i get free odometer readings?


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