"Glendon" > wrote in message
news:1_629473_3ffcac4d085bd124711a9b87f8909aed@aut oforumz.com...

> Without finding
> > the reason
> > that this
> > catcon failed, a new one will be destroyed in short order.
> >
> > Ted
>
> The car has about 200k miles on it.

Have o2 sensors ever been replaced?

> The flashing dash light gives me
> the codes: 12 - 33 - 72 - 55
>

Don't know that one, but maybe you can find it he

http://www.troublecodes.net/

There is also an article on there titled "Catalyst Efficiency Failures"
might be interesting reading.

Ted