If your cat is bad, then your o2 sensor is probably bad. you can have your
exhaust tested for back pressure.
KH

"Elle" <honda.lioness@nospam.earthlink.net> wrote in message
news:bKKbf.731$c_1.152@newsread3.news.pas.earthlin k.net...
> What year is your Civic?
>
> How many miles on it?
>
> Any "Check Engine" lights?
>
> Ever had the oxygen sensor replaced?
>
> Can you comment on the maintenance history of this Civic? E.g. how old are
> the spark plugs, ignition wires, and distributor cap? Have you done oil
> changes regularly? Ever had the PCV valve replaced? Replaced air and fuel
> filters regularly, per the maintenance schedule?
>
> <kwaldman@gmail.com> wrote
>> Lately my civic has started losing power, getting increasingly worse
>> gas mileage, and occassionally making a rumbling noise (especially when
>> it's raining). Most of my research has led me to believe that there's
>> a problem with my catalytic converter. So, 2 questions:
>>
>> 1. For those who know far more than I do, does it sound like a CC
>> problem?
>> 2. Do you know how much this costs to fix?
>>
>> Being a woman in my 20s, I want to be armed with all the necessary
>> information when I take it to a mechanic.
>>
>> THanks.
>>
>
>