It appears the B8 vehicles (A4/A5/Q5) use the same door handle regardless of keyless entry, so they all have the square imprint then.
VCDS is best for troubleshooting. One time purchase, you're done. Does require a Windows system to run the software.
https://store.ross-tech.com/shop/vchv2_ent/
OBDeleven is an alternative if you need something that runs on mobile devices instead. Not as good as VCDS for troubleshooting, more of a pain to get a scan log into a text file you can post such as here, requires an annual PRO subscription to match VCDS functions (basic settings, adaptations, long coding). But cheaper for the basic tool with which you can read codes, clear codes, check measuring values, etc. And you can just toss it in the glove box and leave it there.
https://obdeleven.com/en/home/187-st...&id_currency=3
For the extra cost of the PRO subscription, just get VCDS. For the extra cost of Ross-Tech's HEX-NET (which supports using a browser on a mobile device in addition to the normal Windows software), just get a HEX-V2 and an OBDeleven device.
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