AGR throughput too small

Hello everyone, I replaced the AGR valve (original VW) and performed the necessary adaptation procedure on my 2.0 TDI Octavia 4x4, year 2014 (engine code: CKFC), due to a "low flow" error.
Unfortunately, the error reappears approximately every 200 kilometers.
Please help. Thank you.
VG

Control unit part number: 04L 906 021 EA. Hardware: 04L 907 309 D. Component and/or version: R4 2.0L EDC H22 7546.
Encoding: 11190032032601090000
Operating number: WSC 73430 031 00063
ASAM Dataset: EV_ECM20TDI01104L906021EA 002006 (SK37)
VCID: 6888BEA392FCF2AAF73-803C
Sure, here is the translation of the text from German to English:

"1 error found:"
19206 - Exhaust gas recirculation system.
P0401 00 [11101101] - Insufficient flow.
Warning light ON - confirmed - checked since last reset.
Environmental conditions:
Error priority: 2.
Error frequency: 44
Mileage: 114,379 km
Date: 2024.06.11
Time: 09:40:14
Motor speed: 2275.50 rpm.
Normalized load value: 44.3%
Vehicle speed: 35 km/h
Coolant temperature: 91 °C
Intake air temperature: 97 °C
Ambient air pressure: 970 mbar.
Voltage at terminal 30: 13.980 V.
Learning counter via OBD: 40.
Exhaust gas recirculation (EGR) valve, bank 1: Mass airflow - Target value: 0.0 kg/h.
Exhaust Gas Recirculation (EGR) Valve, Bank 1: Stored fault code - Actual value: 0.00 %
Exhaust Gas Recirculation (EGR) Valve, Bank 1: Mass airflow - Target value: 98.1 kg/h
Exhaust Gas Recirculation (EGR) Valve, Bank 1: Stored Fault - Actual Value: 92.38%
Throttle Actuator, Bank 1: Stored Fault - Actual Value: 85.25%
Air Mass at Air Mass Sensor 1: 97.8 kg/h
Oxygen sensor 1, bank 1, upstream of the catalytic converter: Raw value: 3.1948.
Readiness: 1 1 0 0 0

Hello Luki,

The EGR system needs assistance from the exhaust gas cooler (hot gases have a lower mass per volume than cold gases) and the throttle valve (which reduces the intake of fresh air) when there is a high proportion of exhaust gases in the air being drawn into the engine.

If the ECU's fault memory doesn't show any other errors, there's a high probability that either there's a simple blockage in the EGR system or, for example, the exhaust cooler isn't cooling the exhaust gases effectively.

It's also possible that there's a leak in the intake manifold after the mass airflow sensor (MAF), where fresh air is drawn in, such as a cracked bellows in the crankcase ventilation system.

Ultimately, there can also be measurement errors from the mass airflow sensor (MAF) due to a defect or damaged wiring harness. You can easily test the MAF using an actuator test in VCDS, as the engine's displacement is known. -> Without EGR, the MAF should measure approximately 460-500mg/H of fresh air at idle.

KOBD2Check indicates that your ECU has outdated software, as it lists 04L906021EA with software version 8126 as the latest available.
Keep this in mind in case nothing else works. I'm not very likely to think that the problem is caused by the software.

Best regards, Rainer.