Loud TDi engine (81 kW) and excessive fuel consumption

Good day, I haven't been able to find a solution to my problem in this diesel forum.
I apologize if this has already been discussed, and I would appreciate it if you could provide relevant links.
Mein im Dezember gekaufter VW Bora, (Bj. 2000, 81KW, Automatik) ist seit nun 7000 KM immer lauter geworden. Das Kaltnageln ist lauter als alte Taxi's von Mercedes und warm nagelt er mir bis in den Innenraum. Habe mir nichts gedacht, bis ich meinen Vorgänger gehört habe, auch 81 KW, dessen Besitzer sofort mein Motor auffiel. Dessen Bora war leise! Hier meine allg. BObservations:
- Turbocharger noise is clearly audible.
- Vibrations: none.
- The acceleration has decreased slightly.
- The top speed is reached very slowly, but it does reach 190

They could be the nozzles, but based on the mileage, it's very unlikely.
What about the mileage? Is there a possibility that you've been tricked by someone who tampered with the odometer?

I don't think the car was tampered with; I bought it from Knubel Car Dealership in Aarhus. However, I know that doesn't mean much these days!
Jets? About how much does that cost?

Does it actually happen that installing a chip for more power results in lower fuel consumption if you drive the same way? And is the car capable of handling the increase in performance with reasonable use? For me, the drivetrain, especially the automatic transmission, is only secondary.
My main concern is my extremely noticeable engine, which is very loud. I want it to sound like an old Mercedes, so it needs to be quite noisy.
I'm afraid that if this continues, the entire engine will eventually break down.

That reminds me of something else:
My car's onboard computer calculates an average fuel consumption of just under 6 liters, but I actually have to refuel with at least seven! It was the opposite in the beginning. Back then, the computer always showed a slightly higher value than the actual fuel consumption.
Does that help?

I also find your mileage reading very, very strange!

Who would buy a diesel car with the intention of only driving it 40,000 km over the next 4 years? Excluding ULF (presumably a specific company or situation).

Is the loud hammering always present, or only under certain operating conditions?

'With my Audi (AFN), if I don't properly warm up the engine, it rattles and misfires terribly! But if I let it warm up properly, I don't hear any of that.'

What kind of fuel does it use?

Regards,

Manuel.

The car was supposedly only driven for one year by the original owner. According to the workshop, it didn't sell because it's an automatic transmission.
That's why it was also a good deal, because I don't mind the automatic transmission, and it was available at a relatively low price.

I almost exclusively use Aral or BP diesel. The gas stations have different names now, something like ORV or similar.
I never really questioned the mileage reading... where could I have something like that checked?
Surely a contracting company wouldn't sabotage another one. What do you think? Which workshop should I choose?
And what else are they supposed to check?
Or, what else can I do to prevent that from happening?
And if they find out that it has been tampered with, what can I do then?

So, the car has been sitting in the yard for three years? If that's true, it should be stated in the vehicle registration document. You could also try calling the last registered owner listed on that document.
Otherwise, I would first investigate the error in relation to the NBF (Network Baseband Function).

Hello,

I also think it might be worth checking the basic settings, specifically fields 2 and 9, to see if the EP (electronic power steering) is working correctly, perhaps using a diagnostic tool.

Sure, here is the translation of the text from German to English:

"cu" is a Spanish abbreviation for "con usted," which means "with you." It is often used in online communication and texting as a way to express affection or intimacy.

Here are some examples of how "cu" can be used:

* "Te amo, cu." (I love you, with you.)
* "Eres mi todo, cu." (You are my everything, with you.)
* "No puedo vivir sin ti, cu." (I can't live without you, with you.)

It is important to note that the use of "cu" may be considered informal or even inappropriate in some contexts. It is best to use it only when communicating with people who are close to you and who understand your intentions.