DPF - what is this?

[Ray Singh]

The saga continues. I bought my wife an Audi Ultra about 3 wks ago from a reputable local garage. It has been back to the garage three times in the last three weeks with the EML light on.

The failiure when i read the codes shows as:

1 Fault Found:
19226 - Particulate Trap Bank 1
P2002 00 [101] - Efficiency Below Threshold
Not Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Mileage: 103678 km
Date: 2019.06.24
Time: 15:41:18

Engine speed: 1540.50 /min
Normed load value: 72.9 %
Vehicle speed: 90 km/h
Coolant temperature: 92 °C
Intake air temperature: 82 °C
Ambient air pressure: 990 mbar
Voltage terminal 30: 14.420 V
Unlearning counter according OBD: 40
Exhaust mass flow of low-pressure EGR: calculated: 3.046
Differential pressure ratio: low-pressure EGR: 34.6 kg/h
Exh.recircul. 2: differential pres.sensor 1 bank 1: adap. value: 67.8 hPa
Exhaust recirculat.2: different.press.sens.1 bank 1: raw value: 69.1 hPa
Exh.recircul.valve 1 bank 1: pos.feedback - Act.value: 87.63 %
Exhaust recirc.valve 2 bank 1: posit.feedback - Act.value: 62.07 %
Exh. gas recirc. 2: diff. press. sensor 1 bank 1: dyn. value: 66.5 hPa

I cleared the error code and it came back within 100 miles. The car has been returned to the garage and they have cleared the codes and also tried a regen. Again, the light came on again in a few miles. The garage then tried replacing the pressure sensors and again doing a regen, but the light has come on again.

They now plan to give the car to a DPF cleaning specialist next week. Should I be worried? Should i ensure that both bank 1 and bank 2 are cleaned?

Could the fault be the cleaning cycle itself? I am confused...... Please help.....