P0471 Error: Unlikely Signal - BLS Troubleshooting

Hello, this is my first post here, please forgive me if I make any mistakes. I have a Passat 3C 1.9 TDI BLS and it has been showing a check engine light for the past 50,000 km. I read the error codes with VCDS, and the first code that appears is always:
1 error found!
001137 - Exhaust gas pressure sensor 1 (G450).
P0471 - 000 - Implausible signal.
Environmental conditions.
Error status: 01100000
Error priority: 0.
Error frequency: 1.
Lost counter: 255
Mileage: 199,799 km
Time: 0.
Date: 2023.03.24
Time: 13:42:02
Environmental conditions:
Speed: 0 RPM.
Speed: 0.0 km/h
(no unit): 40.80
(no unit): -25.50
Air mass: 5.69 g/s.
Temperature: 12.0°C
Temperature: 13.5°C

Then, after approximately 20-50 km (depending on driving style and speed), the following error occurs, including an engine check light (MIL):
8194 - Particle filter, bank 1.
P2002 - 000 - Malfunction - Intermittent.
Environmental conditions:
Error status: 00110000
Error priority: 0.
Error frequency: 4.
Lost counter: 255
Mileage: 199,822 km
Time: 0.
Date: 2023.03.24
Time: 18:38:48.
Environmental conditions.
Speed: 1848 revolutions per minute.
Speed: 86.0 km/h
(no unit) 40.80
(no unit -25.50)
Air mass flow rate: 42.97 g/s.
Temperature: 630.0 °C
Temperature: 22.5°C

What else I can say / What I have already done:
The loading coefficient is always at 15%, but when the errors are cleared and both errors disappear (in just a few minutes), the coefficient quickly drops down to 0.
I've already reset the ash mass to zero and performed a forced regeneration, but nothing has worked. I've now adjusted the ash mass back to a value appropriate for the mileage, according to the formula.
'The fuel consumption is normal, and as I mentioned before, I've been dealing with this issue for a long time, but the engine still has full power.'
I replaced the DDS sensor and re-paired it (multiple times, both manually and using VCDS). The error kept recurring. I blew through both lines, and they felt clear.
'What I find very strange, and what I believe is the cause, is that the differential pressure reading for the particulate filter in measurement block 67 of the engine control unit always shows -40.80, and the offset differential pressure shows -25.5. This is true regardless of whether the engine is on or off, under full load or idle, with a new or old DPF sensor, and even after recalibration, it remains the same. Does anyone have any ideas what this could be? I suspect an electronic fault, perhaps? How and where could I check the three electrical wires that run from the DPF sensor to the engine control unit? Or do you think it's something else?'
Thank you very much in advance.

Autoscan.