Yes, only one is "inefficient" per the computer. Namely, bank one. NOx sensors are known to fail on diesels much like O2 sensors. Your only solution here is to replace it. However, they are usually not cheap. As far as difficulty, if you can reach them it takes no more than a half hour. Just like replacing an oxygen sensor. Reply Like. Join Date: Dec 2021. Posts: 180. Likes: 21. Received 54 Likes on 43 Posts. Quote: Originally Posted by phillip001. I wanted to replace the fuel filter on my 2012 audi a8l, wondering if anyone knows where it is located is it under the car or in the tank? Thanks in advance. should be under the car. www.EdgeMotors.comPLEASE LIKE AND SHARE THIS VIDEO!!!in this video we show you how to replace a fuel pump in VW Touareg and Audi Q7 Edge Motorsservice@edgemo Q7; 3.6L, 4.2L; Left. W/GAS ENGINE. W/o diesel engine. 2010 Audi Q7. Genuine Audi Part - 7L8919679 (7L8-919-679) Fuel Filter. Fuel Pump Filter. Location-In Tank 2014 Audi Fuel Pump Filter. Q7; 3.0L TDI. W/DIESEL ENGINE - 7L6127401H - Genuine Audi Part. Enjoy Free Shipping up to $150 on orders over $200. Must enter Code AUDIBELLS2023 at time of checkout. Online only. This video will show you how to change the CABIN FILTER (aka Pollen Filter) on your Audi Q7 (4L 2005-2015).Pollen/ Cabin FilterUSA: Effectively removes the finest particles for greater engine protection Ensures high functional reliability of fuel injection components. $54.95. Hengst® In-Line Fuel Filter. 0. # mpn4642824988. Audi Q7 3.0L Diesel 2015, In-Line Fuel Filter by Hengst®. With Rubber Sleeve. -Shop rags box (Auto paper towels from the local Sams Club) -Black Lightening Nitrile Gloves -1 Large and 1 small pair of pliers -Small paint cup/ bucket to catch the used filters fuel dump. - Vagcom Hex-V2 Cable *Mac running, Win10 in Parallels Step 2: prep and place a bunch of rags below each filter connection. iiZ2.