Hi 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.