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From: Jeff Strickland on 15 May 2010 20:33
"jim" <"sjedgingN0Sp"@m(a)mwt.net> wrote in message
> Jeff Strickland wrote:
>> "jim" <"sjedgingN0Sp"@m(a)mwt,net> wrote in message
>> > Jeff Strickland wrote:
>> >> Bottom line is,
>> >> you either have a bad CAT or a bad sensor.
>> > Not necessarily. Exhaust leaks and corroded electrical connection are
>> > also possible causes of P0420 DTC.
>> Yeah, sure. Out here in California, we don't have much trouble with stuff
>> corroding, but we all know it happens.
> Maybe he's not in Cal.
He said in his original post that he's in California.
>> Seems to me that one would hear an exhaust leak large enough to cause a
>> that says the CAT was bad.
> I have no way of knowing if he hears an exhaust leak or not. A small leak
> in the
> right location would be enough.
Yeah, I don't know that either, but it seems that one would hear an exhaust
leak. I think the problem is that the CAT is below efficiency, which would
tend to mean the exhaust is rich -- it contains to much gas -- and I can't
quite figure out how a leak would make that happen.
But, another thing to look at before pulling out the checkbook is always