[sbc55]

I have just retrofitted Lane Change Assist to my 2017 Q7 4M and i encountered problem when performed basic setting to the modules. 

The used modules were from a Q7 as well and i thought the calibration/measurement numbers will be inherited from previous car. 

Initially i was able to perform basic setting for unit 1 (which i assume is J769 - master). And when i did the measurement for unit 2 (J770), i have error "Master calibration target, measured angle out of tolerance". 

But now, i cant even perform the basic setting for unit 1 and i got error "Slave calibration target not found". 

Anyone know whether the 2 control modules are working or just that i need to drive for some distances so that the 2 modules will recalibrate itself again? 

or it is caused by faulty modules?  If faulty module, which one should i change? 

Thanks.