[A4] How much for a catalytic converter for my A4?

[DocWyte]

Have you read the codes with VAG-COM yet?  If not, that's the first 
thing to do.

furonobono at gmail.com wrote:
> Ok so let's see if I'm understanding this right from all the recent posts. Sorry to beat this subject to death everybody. 
>
> Here's what I gather. The reason why my check engine light is going on and I'm having the intermittent power problems is because my cat converter is having issues. The reason why that is having issues is because I could have a faulty oxygen sensor that was contributing to the problem over time. So replacing just the o2 sensor won't necessairly fix my immediate power problems. It would just stop the blockage that's already there from getting worse. 
>
> Am I understanding it correctly?
>
> I don't want to invest in a new cat converter now only to have it die 20,000 miles later because I have a bad O2 sensor. Although it seems to me any decent mechanic would check that first...
>
> Thanks all,
> Joyce 
>
>