I have a 2004 Audi A3 8P chassis with 83k on the clock.

I have the following DTC error:

1 Fault Found:
16785 - EGR System: Insufficient Flow
P0401 - 000 - - - Intermittent
Freeze Frame:
RPM: 1575 /min
Torque: 44.0 Nm
Speed: 55.0 km/h
Load: 10.6 %
Duty Cycle: 14.7 %
Bin. Bits: 11000000
Mass Air / Rev.: 315.0 mg/str
Mass Air / Rev.: 535.0 mg/str

Yesterday, I removed the EGR valve to find it was really thick with carbon therefore I gave it a good clean almost like new and put it back on again. I thought this would fix the problem, however today I have got the above DTC again. Does anyone know what else could be causing this? Or should I replace the EGR valve now as cleaning it didnt work. I have not noticed any permormance issues with the car, could this be a false alarm or faulty wiring somewhere?

Also, can you recommend a good dealer to souce parts from (Apart from Audi..) I've been looking at Euro car parts for an EGR valve for 73. Anyone know any other good sites?

Any advice would be appreciated.