Question about 2000 Honda Civic

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Trouble shooting P0420 code, bank 1, OBD II for 2000'?

Our 2000 civic (engine D16Y8) has P0420 OBD II code along with misfire on cyl 3 and 4. I changed out the plugs and the distributer cap. Can't get the rotor off yet. Engine running like almost new now despite 178k miles but I am sure when the OBD resets the P0420 code will be back. Dealerships around here have told me the catalytic converter needs replacing but they all want over $1200. That seems insane even for a dealership. I am looking into doing it myself with an "Eastern Direct fit" but before I do wanted to know if anyone thought it could be faulty bank 1 oxygen sensor, if there is a way to test it myself, or is it worth it to replace the sensor first and then check again and move to converter if necessary later? Also has anyone ever used changed out converter with Eastern Direct fit bolt in?
Thanks for any advice,
Dwight

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  • cseanw Jan 08, 2009

    Vitaforall,

    Thanks for the input. Since posting I found the 96-2000 Honda service manual online and was able to save it to desktop. It claims it will be the catalytic converter but I will do as you say and wait and see. According to the manual bad oxygen sensors will have their own code.

    Thanks again!

  • cseanw Feb 26, 2009

    I am convinced by now replacing the plugs and distributer cap was the trick for my particular situation

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Misfiring can cause a P0420 code.
I would recommend a set of honda plug wires and plugs if the P0420 code returns.
I have used bolt in aftermarket bolt in catalytic converters but don't remember the brand name they fit ok and i have had 1 or 2 return with a P0420 code out of about 20. I have never replaced the oxygen sensor on a civic like yours.
I always fix the misfire problems, reset the computer, and have the customer drive it and see if the code p0420 returns. 50% don't have the P420 code return. drive it and see what happens and go from there.

Posted on Jan 06, 2009

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Also FYI http://www.obd-codes.com/p0420

Posted on Mar 25, 2009

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