Audi A6 2016 2.0 TDI 190 CP - 28653 (P204F) Reductant System Performance Bank 1

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Andrada

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Hello! I have some new issues with my car. I was at the service on 3rd September to clean the DEF again. After cleaning, the Check Engine didn't light on. But now, I have another problem. I attached a photo below. Is something about the Adblue. I made a new diagnosis. Today, I smelled a pungent odor from the exhaust pipe while I made the diagnosis. After, I refill with some Adblue, I mention that I haven't filled with Adblue since August last year. After I refill, it didn't smells bad anymore. Is someone who can help me, please?

This is the diagnosis:
Code:
19226 - Particulate Trap Bank 1
         P2002 00 [096] - Efficiency Below Threshold
         Intermittent - Not Confirmed - Tested Since Memory Clear
            Freeze Frame :
                   Fault Status : 00000001
                   Fault Priority: 2
                   Fault Frequency: 5
                   Mileage: 191115 km
                   Date : 2020.09.10
                   Time: 15:33:56
                  
                   Engine speed: 2044.00 /min
                   Normed load value: 32.9 %
                   Vehicle speed: 56 km/h
                   Coolant temperature: 87 °C
                   Intake air temperature: 81 °C
                   Ambient air pressure: 1000 mbar
                   Voltage terminal 30: 14.560 V
                   Unlearning counter according OBD: 37
                   Exhaust mass flow of low-pressure EGR: calculated: 3.004
                   Differential pressure ratio: low-pressure EGR: 29.1 kg/h
                   Exh. recircul. 2: differential pres. sensor 1 bank 1: adap. value: 26.4 hPa
                   Exhaust recirculat. 2: different. press. sens. 1 bank 1: raw value: 25.7 hPa
                   Exh. recircul. valve 1 bank 1: pos. feedback - Act. value: 65.95 %
                   Exhaust recirc. valve 2 bank 1: posit. feedback - Act. value: 41.88 %
                   Exh. gas recirc. 2: diff. press. sensor 1 bank 1: dyn. value: 24.8 hPa
                  
28653 - Reductant System Performance Bank 1
        P204F 00 [101] - Malfunction
        Not Confirmed -Tested Since Memory Clear
           Freeze Frame:
                  Fault Status : 00000001
                  Fault Priority: 2
                  Fault Frequency: 1
                  Mileage: 191354 km
                  Date : 2020.09.30
                  Time: 07:24:53
                  
                  Engine speed: 1961.50 /min
                  Normed load value: 0.0 %
                  Vehicle speed: 115 km/h
                  Coolant temperature: 87 °C
                  Intake air temperature: 93 °C
                  Ambient air pressure: 970 mbar
                  Voltage terminal 30: 14.420 V
                  Unlearning counter according OBD: 40
                  Air mass at air mass meter 1: 42.5 kg/h
                  Extern.temp.sens.1 bank 1: raw valve: 12.0 °C
                  Exhaust recirc. valve 2 bank 1: posit. feedback - Act.value: 99.54 %
                  Exh.recircul.valve 1 bank 1: pos. feedback - Act. value: 99.30 %
                  NOx sensor before SCR cat conv: NOx emiss: 118 ppm
 

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Uwe

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