Having issues with my 2011 a4 2.0tdi Quattro. 
have all kind of lights on dash like abs, traction control etc. plugged it in and got these codes, also voltage is pretty low while running only 13.1v and when engine off drops to just under 12v 

01316- abs control unit

00458- battery monitoring control unit

03705 - voltage stabiliser

00287 - right rear speed sensor

00473 - parking brake module 

plus a few others.

from what I have read all these are linked, have changed battery & coded, changed alternator and changed speed sensor, anybody else had these issues or know the cause? Possible abs module? Help would be much appreciated 

 

Edited February 2Feb 2 by Mikec88

These issues are usually linked to a failing battery but as you've had it changed I wonder if it's a wiring issue from the battery to the dash? 

Or an issue with the instrument cluster. 

Welcome Mike, and sorry to hear of your issue. 
As has been said - your symptoms point to an ailing battery, but interesting that you state you have changed it ( and coded it). 
Sounds good, but being a back to basics guy, I would still want that battery to be checked and declared serviceable before moving on to more costly considerations. Halfords stores will do this for you, and check the alternator output - which is low by your measurements. 
Just a couple of questions:-

Replaced battery was new?

Brand?

Brand of renewed alternator? 
Regards,

Gareth. 

Hello Mike,

Noticed you have recently returned to the forum. 
Any chance you can answer the questions ? 

Noticed you have returned to the forum Mike, but not yet answered the questions asked. 
Regards,

Gareth. 

Any reason you are not able to post a response?