Hi all, I just got a 2016 a6 se executive expecting to get decent mpg. The car has had a full service history but the average mpg is 28.6 to 34.9 the higher is on a motorway. I bought a diagnostic machine (carpal) and it's brought up no engine faults. 18 gms of soot which audi says is normal, the only thing it did is the faults you see in the pics, so is this cause the car is a bit older or is there something else I can check. 

I'd make a note of the codes then clear them. Then see which ones come back. Within a week. I'm assuming you've tested to see if the parking sensors and heat mirrors work? 

What engine and gearbox has the car got? 

44 minutes ago, md1 said:

Hi all, I just got a 2016 a6 se executive expecting to get decent mpg. The car has had a full service history but the average mpg is 28.6 to 34.9 the higher is on a motorway. I bought a diagnostic machine (carpal) and it's brought up no engine faults. 18 gms of soot which audi says is normal, the only thing it did is the faults you see in the pics, so is this cause the car is a bit older or is there something else I can check. 

Hi you say the car has full service history, is it Audi ?, unfortunately the diagnostic system you use only picks up the fault codes but gives no indication of when or the frequency of the fault, I say this as these vehicles have a nasty habit of hanging on to redundant codes, therefore clear all codes and run it for a few days then scan again and see what comes back, also have you checked the pressure sensor flow readings and the ash content of the DPF as all of these will have a bearing on the engines breathing, from experience these engines rarely do what the maker claims not forgetting its a heavy car, is it an auto? as that wont help, the main priority is to check things such as battery age as some of these faults could well be low voltage, the fresh air sensor is a painful one as if you buy a new one [not cheap] it will be exactly the same within a year they are simple to remove and soak in isopropyl for an hour and they come back to life, if you intend to keep the car I would seriously consider a better diagnostic device.

Steve

A good friend of mine is a vw technician he's gonna take it up and put it on their system to see if it unveils anything 

Please keep us posted on how you get on