Quote Originally Posted by DV52 View Post
Notwithstanding Hillbilly's sage advice - I suspect that the DTCs (error codes) were produced as part of the installation process. Blind spot assist (if it's the App that lights-up the LEDs on your mirrors) uses a couple of radar devices that are located in the driver and passenger side fenders (lower part of the rear hatch area). They don't like to be disconnected from the CAN network because it messes with the "parameterize" variables - which are a set of basic settings that are established when the radars are first installed.

Clearing the DTCs is easy and re-setting some basic settings on the control modules can be easy using a number of diagnostic devices like VCDS, VCP or OBD11. However, depending on the type of error message that occurred on the Blind-spot radars (I assume this is what happened in your case) - re calibration can require the use of a special alignment tool which only dealers (and some specialized independent shops) have.

Of course, given the limited information about the exact nature of the error messages - I'm just guessing!!

Don
Thx DEVIANT52 (. In the process of fitting the "free" cam to the front bumper I did disconnect the plug to the radar do-dad of the VW badge as I gained access by removing the top front grille. Maybe that affected the rear fender radar arrangement.
The gap distance system (using front radar) for Adaptive Cruise Control has always been fine and was unaffected after battery re-connection and driving for a spell.