Thanks curly,

I have never had poor starting problems with my car.. after a weekend
sitting idle...he was planning to replace the second sensor.. according
to what i have understood..

thanks for your help... i think i shall go ahead with the replacement..


ritesh

'Curly Q. Links' wrote:
> ritesh.noronha@gmail.com wrote:
> >
> > Hi..
> >
> > I have a 1998 honda accord V6. I got the Check engine light today,
> > using an OBD scanner i found out the code was "P0420 - Catalytic
> > emission low on Bank #1". The local repair shop tell me that i need to
> > get the Catalytic convertor and the 02 sensors replaced.
> >
> > I have the following questions for the group.
> > 1. Does the code P0420 mean that the catalytic convertor is bad?
> > 2. He quoted the cost for a replacement Catalytic convertor for $550
> > and O2 sensor for $138.. do these seem high?
> >
> > Just a few days back i had replaced the alternator in this car .. FYI..
> >
> > Thanks,
> > Ritesh
> --------------------------------------
>
> "Catalyst system efficiency below threshold" is the interpretation. Your
> second O2 sensor says that the CAT isn't scrubbing enough stuff from the
> exhaust. It MIGHT just be the second O2 sensor's fault. (have you ever
> had 'poor starting' after sitting overnight / weekend?) Maybe you've
> never cleaned your injectors and so you've got a damaged CAT on that
> side. Maybe you've used too many additives and have a damaged CAT. More
> likely the former.
>
> If it was mine, I'd do a tune -up, reset the code, put a can of techron
> into a full tank and drive it until it was almost empty, preferably on a
> long, fast highway drive on a hot day. The prices quoted are good to
> low, as long as the O2 sensor is a real NGK. If it's Bosch, tell him to
> get you a REAL sensor. Was he going to replace the first or second
> sensor, BTW.??
>
> 'Curly'