andysprague

There was a large piece of the honeycomb material that was broken off, turned sideways & almost completely blocking the outlet of the cat. There was about 1/2 inch by 1 inch area for the exhaust to flow. No wonder the car would barely run.

Job wasn't terrible. Turbo to cat bolts came off easily. Cat to DP bolts were a PITA. Whole job took about 3 hours total.

Intial impressions are that the car runs alot better than before the problem, but I guess that makes sense with the freed up exhaust flow.

No CEL yet, but I'm sure it will come soon.

EDness

nice andy! glad that was an easy fix!

das schnell

I think you can put soe spacers or something on the second o2 to trick it and not get a cell.

andysprague

I am going to try that or the Pony Express MIL eliminator. I have heard that both will work.

chipstar-32

thats a big relief. congrats!

ModifiedA4

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BSCA4

My friend the spark plug spacer in his test pipe and no CEL

Justin517

it does work but on realy hot days ill still get a code (cat below threshold), and now n then i get an intermitent short one, i think thats a bad splice on my part though. im going to get a new rear sensor and try the spacer trick. people use spark plug "anti-fowlers", 2 of them stacked, you have to drill the one the O2 sensor goes into to clear the dome of the sensor, i hear it works realy realy well.

andysprague

Any idea what size non-fouler I need? I see 14mm &amp; 18mm available online.

Yippers®

<ul><li><a href="https://forums.audiworld.com/a4/msgs/2254912.phtml">Day late and a dollar short </a></li></ul>