Audi A4 B9 multiple module warnings after a coding change
I was looking at a 2019 Audi A4 B9 2.0T after the owner changed a few comfort features with a third-party coding app. Auto-fold mirrors, lighting behavior, start/stop memory, that kind of thing.
Afterward it started showing parking brake, lighting, and driver assist warnings. I checked the topology view on a topdon ONE first. The marked modules were mostly around the gateway, body electronics, door module, parking brake, and driver assist.
That didn't prove it was a coding issue, but it showed the faults weren't scattered randomly across the car. From there I checked the recent coding/adaptation changes against the car's actual equipment. A few settings looked questionable, so they were rolled back, then the needed basic settings were run.
After clearing faults and cycling the car, most warnings didn’t come back during a short test drive. I’d still want more drive time before calling it done, but it was a good reminder that Audi feature coding can affect more modules than expected.