You will definitely need to perform coding even on CANBUS error-free bulbs. The reason for this, as is probably explained on numerous other LED bulbs replacement threads, is because LEDs draw far less current and power than normal incandescents. On the normal bulbs, the car sends a little pulse of current during start-up and every few minutes when driving, to check that the bulb is still working. This doesn't cause the incandescent to light up because it needs more current than what the car's pulse is giving it; however with LEDs, it causes them to flicker rapidly whenever the pulse is sent and that needs to be coded out.
Using E-Sys, the codes that need to be changed for the front two turn signals in are:
(For left bulb)
FEM_BODY 3061 FRA_V_L_KALTUEBERWACHUNG aktiv --> nicht_aktiv
FEM_BODY 3061 FRA_V_L_WARMUEBERWACHUNG aktiv --> nicht_aktiv
FEM_BODY 3061 FRA_V_L_IS_LED nicht_aktiv --> aktiv
(For right bulb)
FEM_BODY 3061 FRA_V_R_KALTUEBERWACHUNG aktiv --> nicht_aktiv
FEM_BODY 3061 FRA_V_R_WARMUEBERWACHUNG aktiv --> nicht_aktiv
FEM_BODY 3061 FRA_V_R_IS_LED nicht_aktiv --> aktiv
