The scan tool I mean is the equipment to scan CAT system including O2
signals not the OBDII reader. I went to the local exhaust shop this
morning, they were not happy. They claimed that it was impossible for a
brand new CAT going bad within a month, there must have something wrong
with my car. They argued that there are a lot of factors which might
cause P0420 code set by the computer and they asked me to send my car
to dealer for check up, and they would not honor the warranty unless
dealer says it is bad(they were not convinced that CAT could be
defective). I am wondering whether there is other factor(s) that may
set P0420? I like to cancel the code and wait to see what will happen
next since it just passed the inspection and I have a year to find out.
I am wondering whether there may be false alarm for some unknown
reason. Anyway, it is very frustrated for me having to deal with P0420
code allover again.
On Oct 12, 12:39 am, "Ray O" <rokigawaATtristarassociatesDOTcom>
wrote:[color=blue]
> <wenm...@yahoo.com> wrote in messagenews:1160609005.854927.323010@m7g2000cwm.googlegroups.com...
>[color=green]
> > Thanks Ray. I live in PA and I don't think that any place in US sells
> > leaded fuel
> > and I see no smoke coming out of exhaust pipe. The place where I have
> > CAT
> > replaced doesn't have scan tool. So I may have to send my car to other
> > place for the
> > scan in order to make sure that O2 sensors are good before exaust shop
> > can carry
> > out warranty otherwise, they probably won't do anything.No regular gas stations sell leaded fuel, and
AFAIK, leaded fuel is not[/color]
> available in the U.S., but I like to cover all bases when I think of it ;-)
>
> No smoke out of the tail pipe is good!
>
> If the place that replaced the cat does not have a scan tool, then how did
> you get the code? If you have a personal scan tool, perhaps the shop that
> replaced the can use it to check the codes. You can chcek O2 sensor
> operation with a volt meter.
>
> If the cat is aftermarket, I'd bet that the replacement cat is bad.
>
> Good luck!
> --
>
> Ray O
> (correct punctuation to reply)
>
>
>
>
>[color=green]
> > On Oct 11, 6:55 pm, "Ray O" <rokigawaATtristarassociatesDOTcom> wrote:[color=darkred]
> >> <wenm...@yahoo.com> wrote in
> >> messagenews:1160599775.545655.124910@k70g2000cwa.googlegroups.com...[/color][/color]
>[color=green][color=darkred]
> >> > Hi,[/color][/color]
>[color=green][color=darkred]
> >> > It is raining today, on my way home, the check light turned on and I
> >> > checked, it reads P0420. I just have CAT and 2 O2 sensors(front adn
> >> > back) replaced about a month, how come? what possibly went wrong? What
> >> > should I do next?My guess would be that the replacement catalytic
> >> > converter is defective or
> >> something is contaminating the catalyst.[/color][/color]
>[color=green][color=darkred]
> >> Leaded fuel or huge amounts of engine oil leaking into the combustion
> >> chamber (with accompanying blue-gray clouds out the exhaust) could
> >> contaminate the catalyst, but if you don't see the blue-gray smoke and
> >> you
> >> haven't used leaded fuel, then a defective catalytic converter is likely.[/color][/color]
>[color=green][color=darkred]
> >> I would bring the car back to the place that installed the cat and
> >> sensors
> >> for a warranty repair.[/color][/color]
>[color=green][color=darkred]
> >> Good luck!
> >> --[/color][/color]
>[color=green][color=darkred]
> >> Ray O
> >> (correct punctuation to reply)- Hide quoted text -- Show quoted text -[/color][/color][/color]
