Go Back  AudiForums.com > Audi Models > Audi A8
Strange whinning noise from dash >

Strange whinning noise from dash

Audi A8 This full sized Audi A8 sedan offers interior luxury and spaciousness comparable to any car in the full sized luxury sedan class

Strange whinning noise from dash

Old 09-13-2008, 02:13 PM
1st Gear
Thread Starter
Join Date: Feb 2008
Location: Ireland
Posts: 13
Default Strange whinning noise from dash

I have a 00 A8 4.2 quattro.
The car runs fine exept this strange noise that seems to come from the dash, it is very infrequent, it sounds like an small fan. i cant seem to figure out what triggers it to come on or what turns it off. it seems to come on when i first start the car but not every time. Its loud and very noticeable.
Any ideas on what it is?
How do i fix this?
Old 09-13-2008, 09:52 PM
auditech79's Avatar
Site Moderator
Join Date: Feb 2007
Location: Nor Cal
Posts: 9,004

Its probably the SAP (secondary air pump) going bad. What the pump does is inject air into the exhaust upon cold start to heat up the cat converters faster, it lasts for about 1 minute then turns off. When they go bad it could either sound like a vacuum cleaner or a loud whine. If you can locate the SAP pump under the car disconnect the electrical connector and wait for another day to try a cold start. The pump is a large plastic pump that has a hose that goes to the air box, follow the hose from the air box down to the pump if you don't know where it is.
Related Topics
Thread Starter
Last Post
Sights N Sounds
01-16-2012 04:28 AM
B6 Models
04-05-2008 03:37 PM
Audi A8
01-07-2008 02:11 PM
Audi A8
10-23-2006 06:01 PM
Audi A4
11-25-2005 01:34 AM

Thread Tools
Search this Thread
Quick Reply: Strange whinning noise from dash

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.