Compatibility:
This was done on my 2016 Audi A6 3.0 TDI. I cannot confirm if this is the same for other models. I assume it is probably the same for C7 2013-2018 with the 3.0 TDI engine.
Why:
Audi recommends the fuel filter on 3.0 TDI engine to be replaced every 20k miles. My local dealer wanted $195 for this service I decided I would just do it when I rotated my tires.
Disclosure:
This is my first time ever replacing this filter. My DIY might not be the perfect way to do it, and as always do at your own risk. I learned off another forum and couldn't find any help on this forum so I thought I would post one. This took me about 1hr (took video and pictures as well as learning) if I did it again I could do it in 30 min.
Things needed:
Vagcom to manually prime the pump after filter replacement (or some way to make the pump run to bleed the air). Jack or a way to lift the passenger side of the car (Stock jack works fine). 10mm socket, catch pan, and rags you don't care about. Hose removal pliers really come in handy here (I got mine at my local O'Reillys).
Step One:
Raise front passenger side of vehicle safely.
Step Two:
Remove underbody cover using 10mm socket. Roughly 7-8 bolts. You can have it just hang down partially or remove it all to make it easier to not spill diesel on it.
Step Three:
Remove the metal cover protecting fuel filter. If its not a 10mm then it was an 11mm. 1 bolt was missing on mine and the other was bent...
Step Four:
You should now very clearly see the fuel filter. Remove that annoying rubber piece that keeps all the lines together and prepare to remove the filter from the lines. Have the caps of your new filter close to you so when you remove the rubber lines you can cap the filter to stop it from leaking. Not much diesel came out of the lines but use the rags or a catch pan to keep spillage to a minimum. Side note if you have a watch remove it (my galaxy watch got diesel on it). Remove the clamps closest to the filter and pull the lines off the filter.
Step Five:
REMEMBER Arrow points towards engine. Move the rubber O-rings to the new filter and install the lines back. Also don't forget to put the rubber piece that supports the fuel lines back in. Move the clamps back in place as well.
Step Six:
Use VCDS to prime the fuel pump. I have a picture attached but I'll explain it here. Basic>>>Settings>>>Transfer Fuel Pump Test>>> GO. I didn't hear anything during the test, but others have stated they hear gurgling for 5-10 seconds. Inspect for leaks and hit STOP.
Step Seven:
Turn on engine and check for leaks one more time. (My car did not hesitate at all). If all is well shut off engine and reinstall metal fuel filter cover and passenger underbody trim. If all is not well proceed to cry.
God speed gents.
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2016 A6 TDI*|*Mugello Blue, Pearl EffectExterior | Alabastar White Interior | Audi Exclusive Line | Eucalyptus Natural Wood Decorative Inlays | Prestige Package | Comfort Seating Package | Driver Assistance Package | S Line Sport Package | 20" Black Optic Package | Cold Weather Package | 18% Ceramic Film Windows | 70% Ceramic Film Windshield | Thinkware F800 Pro Dash Cam | Audi All Weather Mats*|1 of 1 for 2016
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Originally Posted by Coolrunning
. Doing a 60k service at audi here would be around 1650usd. By replacing all the filters my self and getting an authorized different workshop to do inspection and replacing the gearbox oil I'm ending up approx 500usd. So quite the diffence 
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