Re: P0420 code from check engine light 2000 Mazda Protege?

"Chuck" <Chuckk2nospam@[EMAIL PROTECTED]
> wrote:

>It's also possible that the first O2 sensor is getting a bit long in the
>tooth.
>Usually, the front sensor fails before the rear one. On my Miata, the
front
>sensor had a slightly lower output and had a bit slower response than a
good
>sensor. This caused the 420 code to set periodically. A reset might be OK
>for months, a week, or a day. I only spent about two years screwing
around
>with this and that before I broke down and replaced the sensor.

Ok thanks..... should I go ahead and replace BOTH
sensors if getting the job done by a mechanic?

I'm unemployed and would MUCH rather replace a couple
of sensors than a catalytic converter itself as I'm
assuming a new converter is gonna cost abt $500 or
more. yes?