audi a6 c6 2.0 tdi 170ps

Hi All, recently I noticed that my diesel engine is running a bit louder. No knocking sounds, no ticking sounds, nothing what would indicate bad injector or rod bearings. Just same diesel working sound but louder. Below video showing the noise. I am now not sure if it's louder or just my mind is...

Ive just had the car scanned and it has come back with 3 Fault codes, i'm hoping somebody could help explain what exactly they mean! etc.. 4695-U1113 Function restriction due to received malfunction value - short to ground. 4699-U1113 Function restriction due to received malfunction value -...