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Car Forum / Audi Cars / June 2009

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Catalytic converters

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Paul Dhuse - 10 Oct 2008 06:17 GMT
Well, it sounds like my '98 A4 2.8 needs new catalytic converters.  

Has anyone replaced them themselves?  The dealer here wants about
$1500 per side...

Oh, yes, I'm in California, USA, so all the 49 state legal ones that I
find at on-line stores are probably illegal here.
--
frob - 10 Oct 2008 15:58 GMT
I did it on my 1.8T, it's not a complicated job but there is very littl
access/clearance to get at some of the bolts, which are probabl
rusted/seized on, so its a b*** getting them off, and slightly less s
torquing the new ones on. having a lift would definitely help, or a
least jack up the car on all 4's as high as you can first, and spra
penetrating oil on the nuts at least the night before (don't start th
engine until you're finished). It helps to have a few ratchet extension
and swivel joints /swivel sockets, & a long handle swivel head 3/8
socket wrench.

For $1500 ea/ i'd get a second opinion. its possible there's a lot mor
in the way on the V6 that needs to be removed first, compared to th
1.8T, but its hard to imagine how it could take more than 1/2-day, or
day for a complete noob home mechanic

What make you think you need new CAT's anyway?  I though mine was dea
too, turns out its just the O2 sensor, cat was fine

--
fro
Paul Dhuse - 12 Oct 2008 06:05 GMT
> I did it on my 1.8T, it's not a complicated job but there is very little
> access/clearance to get at some of the bolts, which are probably
[quoted text clipped - 10 lines]
> 1.8T, but its hard to imagine how it could take more than 1/2-day, or 1
> day for a complete noob home mechanic.

The problem is that the replacements don't seem to be available for
the CARB certified ones.  If I lived in the other 49 states, it would
be easy.

> What make you think you need new CAT's anyway?  I though mine was dead
> too, turns out its just the O2 sensor, cat was fine.

It's rattling and I checked with a mechanic that I trust.  He says
that Audi wants abou $900 for the converter alone.  "It's got platinum
in it" - says the Audi Service guy.

Thanks.  

--
davetremblett - 18 Jun 2009 01:22 GMT
what are the symptoms of a Cat that needs replacing?

I just had my car drive cleaned and it passed. But the codes say tha
it is below threshold.
Not really noticing and poor performance, but engine light is on

Just curious if anyone know

--
davetremblet
dave AKA vwdoc1 - 18 Jun 2009 13:43 GMT
AFAIK
poor performance or increased emissions or sometimes a very foul odor.
can be visually inspected when removed or possibly the exhaust can be tested
before and after cat.

> what are the symptoms of a Cat that needs replacing?
>
[quoted text clipped - 3 lines]
>
> Just curious if anyone knows
Steve Daniels - 19 Jun 2009 02:43 GMT
On Thu, 18 Jun 2009 07:43:19 -0500, against all advice, something
compelled "dave AKA vwdoc1" <vwdoc1nospam@pleasehotmail.com>, to
say:

>     AFAIK
>     poor performance or increased emissions or sometimes a very foul odor.

A foul odor from a cat.  Who would have thunk it.

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john - 23 Jun 2009 04:23 GMT
It may be old oxygen sensors. Here is an excellent article on the
issue. The converter is usually the victim and not the villain. So one
must also make sure the engine is properly tuned up and oxygen
sensors, if over 100K miles, considered replaced. If you can use Bosch
Planar type (such as #15738 but requires splicing old connector)
that's more resistant to contamination, use them. I'd stay away from
older thimbles or other makes like Denso.

http://www.motor.com/magazine/pdfs/012009_02.pdf

http://www.boschautoparts.com/Products/OxygenSensors/PlanarO2

On Jun 17, 5:22 pm, davetremblett <davetremblett.3tz...@no-
mx.audiforum.ca> wrote:
> I just had my car drive cleaned and it passed. But the codes say that
> it is below threshold.
[quoted text clipped - 7 lines]
> davetremblett's Profile:http://www.audiforum.ca/member.php?userid=10460
> View this thread:http://www.audiforum.ca/showthread.php?t=30426
 
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