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D4 - Common Faults Quick links to all known common faults and their solutions

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  #11  
Old 9th May 2016, 12:14 AM
nath nath is offline
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from the problems described by other a8 owners
apparently fluid is pushed down the wiring loom into certain connectors
it can actually get that bad it ruins a whole heap of parts

engine wiring loom
ecu
hvac system

im going to get mine checked out shortly to ensure i have not got the start of a very expensive problem to sort

i also think this needs to be taken up with audi u.k and with the dealerships

im going to do my homework on this as it sounds pretty serious
when i do check out my car ill photograph everything so as other owners can get an idea of whats involved
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  #12  
Old 9th May 2016, 12:31 AM
nath nath is offline
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the effected parts appear to be

Transmission Coolant Valve - N488
It looks like the part has already been revised once: 4H0121670A

n509


would be great if someone with elsawin or the likes could put a few pictures up so as we knew what the possible problem could be

if there are any a8 owners up or around south yorkshire and would like there car scanned for this potential problem
please message me im literally 2 minutes from junction 36 of the m1
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  #13  
Old 9th May 2016, 07:35 AM
Joe2.0E Joe2.0E is offline
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Keep us posted, it sounds like megabucks to sort if ignored.
It may only be an issue on early D4 models if they have revised the parts already.
When I was looking at used D4's last year, I came across a 2012 one "in preparation" at a main dealer. It had the passenger seat removed, the carpet in the passenger footwell pulled back and lots of trim removed under the glovebox area. The Salesman mentioned it was waiting on some electrical parts as the aircon drains had blocked flooding the footwell ?
I walked away obviously but I wonder now if it was this coolant/wiring issue.
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  #14  
Old 9th May 2016, 07:46 AM
limoncello limoncello is offline
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the D4's in the other threads appear to be in the main 2011/12 D4s on fairly low mileage as far as i can see. we are taliking about 3000 to 23000 miles.

one of the guys had a bill for 8K dollars, most of the others were on warranty, so we are looking at multiple modules, and of course putting in a new loom that will probably add a huge amount of hours to the bill.
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  #15  
Old 9th May 2016, 08:44 AM
paulrstaylor paulrstaylor is offline
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Quote:
Originally Posted by nath View Post
the effected parts appear to be

Transmission Coolant Valve - N488
It looks like the part has already been revised once: 4H0121670A

n509


would be great if someone with elsawin or the likes could put a few pictures up so as we knew what the possible problem could be

if there are any a8 owners up or around south yorkshire and would like there car scanned for this potential problem
please message me im literally 2 minutes from junction 36 of the m1
Found this - suspect it will contain what you are looking for or at least a few pointers?
Attached Files
File Type: pdf SSP 456 Audi A8 '10.pdf (6.18 MB, 1087 views)
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  #16  
Old 10th May 2016, 07:23 AM
Joe2.0E Joe2.0E is offline
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Good Find. Is there a version available that covers the 3.0TDI engine ?
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  #17  
Old 10th May 2016, 09:20 AM
paulrstaylor paulrstaylor is offline
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Quote:
Originally Posted by Joe2.0E View Post
Good Find. Is there a version available that covers the 3.0TDI engine ?
Sorry I don't have access to a repository, I found it using creative google searches.

I suspect the 3.0 is omitted as the document was dated 2010 the D4 was launched with the 4.2TDi and 4.2FSI engines only?
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  #18  
Old 10th May 2016, 09:48 AM
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Architex_mA8tey Architex_mA8tey is offline
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I've now moved all the D4 information files to Common Faults Sticky HERE now
There is a document on there specific to the 3.0 Tdi Engine
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  #19  
Old 13th May 2016, 04:22 AM
nath nath is offline
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going to do the inspection on my vehicle this morning
i will try and get photos of the offending items
so as its easy for other people to identify
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  #20  
Old 20th May 2016, 10:57 PM
nath nath is offline
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right guys
the offending article appears to be accessible by removing your **** guard under the car (be warned it has a lot of screws and fixings )

and carefully removing the plugs to see if they are wet at all

one brown plug and one black one (one of which is difficult to access as its up against the intercooler )

https://www.flickr.com/photos/235252...posted-public/

may just be worth you keeping an eye on your own car
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