How to replace Catalytic Converters 2000 A4 B5 Avant 2.8 Quattro

[Huw Powell]

You're screwed.  This is a $2k hosing.

On 10/29/2011 10:09 PM, Werner Raschdorf wrote:
> The Patient is a 2000 A4 B5 Avant Quattro with 2.8 ltr V6.
> Got a code from VAG COM which reads: 16805 - Warm Up Catalyst; Bank 1:
> Efficiency Below Threshold
>          P0421 - 35-10 -  -  - Intermittent
> I've had the same code intermittently pop up for Bank 2 as well. Was told
> by the dealer 2 years ago that both Cats are in need of replacement. Both
> sections of flexpipe are worn through so they need replacement for sure
> now. I bought the new cats and downpipes from Bosal and have looked at
> Audiworld for help in how to replace these myself. The left side on the
> drivers side does not appear impossible to reach with some contortion.
> There are 3 bolts that hold the downpipe onto the exhaust manifold. The
> passenger side however looks impossible to reach those 3 bolts. Any
> suggestions from the experts as to how one can reach those bolts and from
> where? Also, the O2 sensors are not showing any faults on VAG COM. Can they
> be reused or do they have to be replaced at the same time? I am also
> installing a Miltek Cat-back exhaust system after I get the new Cats
> installed.
> Any help would be appreciated!
> Werner
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