robbinthehood

Over the last few weeks, I've noticed my exhaust sounds a bit more muffled than usual. I'm not hearing any clanking or loose parts, it just sounds more like a Civic with a can than the quiet, subtle tones I'm used to hearing.

I did some quick reading and it sounds like it could be the Cat Flange has cracked, but I honestly don't have a clue where to start or how to diagnose.

Anyone have any ideas on what could be causing this? Or is it all in my head?

chapstick

Open up the hood and put the car on jack stands then find out.

djhateley

Known fixes and bulletins from Autodata

Bulletin



Affected vehicles

• All models, →VIN 8E4A140001.

Problem

• Bubbling noise from rear silencer when accelerating.

Cause

• Condensation build up in rear silencer.

Remedy
<table width="80%" align="center" border="1" cellspacing="2" cellpadding="2"><tbody><tr><td align="center" class="red" colspan="4">Parts</td></tr><tr><td>Description</td><td>Part number</td><td>Model</td><td>Quantity</td></tr><tr><td>Rear silencer</td><td>8E0253609FD</td><td>A4, RHD</td><td>1</td></tr><tr><td>Rear silencer</td><td>8E0253609FC</td><td>A4, LHD</td><td>1</td></tr><tr><td>Rear silencer</td><td>8E0253609ET</td><td>quattro, RHD</td><td>1</td></tr><tr><td>Rear silencer</td><td>8E0253609ES</td><td>quattro, LHD</td><td>1</td></tr><tr><td>Rear silencer</td><td>8E0253609FB</td><td>A4, reinforced bumpers, RHD</td><td>1</td></tr><tr><td>Rear silencer</td><td>8E0253609FA</td><td>A4, reinforced bumpers, LHD</td><td>1</td></tr><tr><td>Rear silencer</td><td>8E0253609FF</td><td>quattro, reinforced bumpers, RHD</td><td>1</td></tr><tr><td>Rear silencer</td><td>8E0253609FE</td><td>quattro, reinforced bumpers, LHD</td><td>1</td></tr></tbody></table>

• Fit modified rear silencer.