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

Aaron Jongbloedt jungle at hickorytech.net
Wed Jan 23 21:54:39 PST 2008

A 2ndary O2 sensor will not cause any drivability issues.....it will throw a
check engine light, but that is the only thing you will notice.  The 2nd one
is ONLY for purposes of determining if your cat is functional.  The primary
one is for adjusting fuel mixture.

It still could be your cat...the guts of mine had come undone as a single
piece, and then jammed itself sideways down the cat a bit further.  I
unknowingly drove the car for a while that way...it steadily got worse....I
probably only knew something was up because my car is not stock and has a
boost gauge.... But yeah....by all means do get the codes and get a 2nd
opinion even if you have to pay $100 for diagnostic time. 

-----Original Message-----
From: a4-bounces at audifans.com [mailto:a4-bounces at audifans.com] On Behalf Of
Joyce Furono
Sent: Wednesday, January 23, 2008 11:34 PM
To: a4 at audifans.com
Subject: Re: [A4] How much for a catalytic converter for my A4?

I live in San Francisco, so drastic temperatures changes places like
Colorado has don't happen here. And the car lives indoors. I pay extra for

I've decided to first ask my mechanic for the codes and ask if he's thought
about my 2nd oxygen sensor being the culprit rather than a bad cat
converter. Then I can leave it as is and have a much cheaper repair.  As
Peter said, if it was completely blocked then I would have power problems
all the time. That makes sense to me. As it is I have no problems when I'm
driving on flat land whatsoever. When my car hits 140,000 miles, I'll be
much more open to getting a replacement...

However it makes me feel a little better knowing that Audi charges an arm
and a leg for the cat converter. He generally tries to get genuine parts
unless asked otherwise. He didn't say it was broken, or that he could hear
anything rattling around in there. He specifically said it was blocked.

Thanks for all the thoughts!
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