replacing front primary/warmup cats in 30v 2.8
Thread Starter
New Member
Joined: Mar 2006
Posts: 65
Likes: 0
replacing front primary/warmup cats in 30v 2.8
have been getting P0430/P0420 (cat inefficiency on bank 1 and 2) and recently replaced the rear o2's and rear cats. still getting the CEL so i'm going to try replacing the front o2's and the front warmup cats since that's the only other thing i can think of. i started with the rears thinking they could be bad and giving a faulty reading. i'm out of the VIN range for the ECU flash and out of the federal emissions warranty.
has anyone replaced the front warmup cats in a 30v 2.8? can they be welded in by an exhaust shop? what brands are out there and where can you get them from? i'm going to go for replacing the front o2's and the front warmup cats and if that doesn't fix it or if i can't find any solution, i'm looking to sell.
has anyone replaced the front warmup cats in a 30v 2.8? can they be welded in by an exhaust shop? what brands are out there and where can you get them from? i'm going to go for replacing the front o2's and the front warmup cats and if that doesn't fix it or if i can't find any solution, i'm looking to sell.
Head Cat Herder
Joined: Oct 1998
Posts: 66,550,462
Likes: 103
Try some non-foulers first....
the cats are probably fine, but the ECU's threshold is too low. Using a non-fouler will pull the secondary O2 sensor out of the direct exhaust flow and 'fool' the ECU into thinking it's getting cleaner readings.
Thread Starter
New Member
Joined: Mar 2006
Posts: 65
Likes: 0
Re: Try some non-foulers first....
i think i did have some misfires going on for a while when i first bought the car that could have fouled up the primary cat. anything at this point is worth a shot within reason.
none-the-less, the rear o2's are easy to get to so this sounds like something i can do in the driveway. i'm looking for "non foulers" now but if you have a link and say "buy these", that works too
none-the-less, the rear o2's are easy to get to so this sounds like something i can do in the driveway. i'm looking for "non foulers" now but if you have a link and say "buy these", that works too
Club AutoUnion
Joined: Mar 2000
Posts: 31,629
Likes: 49
From: Fort Collins Colorado
Had not heard of these - but you are right Kris - they should work
the ECU is looking for a steady state reading from the exhaust - and not one that follows the first O2 sensor. Most chips for the 1.8T will allow you to ignore the secondary reading but I guess there are no chip now for the 2.8 that will do this.
Head Cat Herder
Joined: Oct 1998
Posts: 66,550,462
Likes: 103
Peep at this...
<a href="http://www.autozone.com/az/cds/en_us/0900823d/80/04/ba/2b/0900823d8004ba2b/repairInfoPages.htm"><img src="http://www.autozone.com/images/cds/jpg/small/0900823d8004ba2c.jpg"></a>
Trending Topics
AudiWorld Stories
Bringing Audi to Life for Audi Fans
Top 10 Most Expensive Audis Ever Sold on Bring-A-Trailer
Brett Foote
10 Audi Features & Options We Miss the Most!
Joe Kucinski
Audi Recreates Crazy-Looking Speed Record Breaker From 1935
Verdad Gallardo
Coachbuilder Recreates the 1995 Audi TTS Concept
Verdad Gallardo
Every Audi V10 Car Ranked!
Joe Kucinski
9 Audi Designs That Aged Like Fine Wine
Verdad Gallardo
2026 Audi Q5 Buyer's Guide (Every Model Explained)
Brett Foote
Ranking Every Current Audi 'S' Model From Worst to First!
Joe Kucinski
10 Best Audis That are FINALLY LEGAL to Import to the U.S.!
Joe Kucinski
Thread
Thread Starter
Forum
Replies
Last Post
loustylez
30v V6 Discussion
2
Feb 25, 2008 05:02 PM
loustylez
A4 (B5 Platform) Discussion
5
Jan 10, 2008 09:53 AM
madcowz
A4 (B5 Platform) Discussion
0
Sep 19, 2004 09:31 PM
