Foxflash programmer will read and write VAG EDC16U1 ECU by OBD without problem.
Many models were tested.
1).
Audi a3 2.0 tdi
ECU: EDC16U1
Read via OBD ok
Write via OBD ok
Checksum ok
Hot start -fix-ok(solution)
2).
VW Golf 5 edc16u1 read, write, checksum ok, Egr off,OBD mode
3).
SEAT Altea EDC16U1 Read, write via OBD, checksum by fox flash
Bench mode also works.