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There doesn't seem to be any images of 8R0 201 991 AH, the hose from the EVAP vapors hard line to the N80 EVAP purge valve. But yes, it's unlikely Audi factory used zip ties. AH was replaced by AJ. We see an image of rev AJ here: https://www.audipartsstore.com/oem-p...se-8r0201991aj The parts catalog denotes the hose pieces are secured to the middle expansion chamber by N 906 867 01 (14x12). And the hose ends' connections to the N80 purge valve and to the vapor hard line are secured by N 909 865 01 or N 910 203 01 (14.5x12).
P0456 says only what it says. When it tests the fuel tank for leaks, it detects the pressure reduce at a "very small leak" rate. Where it's leaking is anyone's guess, without a smoke test showing "oh, there it is". Fuel cap is not uncommon, and not "expensive" to just try.
P052E is not even documented by Continental (Simos owners), so who can guess how it actually triggers. P052E - Ross-Tech Wiki Google search "audi 3.0t p052e" brings up plenty of research for you. Could likely be related to the valve that the CTU engines added to the breather hose; you don't mention if you have a CGX or CTU engine. https://www.audizine.com/forum/showt...1#post14593245
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P052E is not in 2013 Audi Q5 Quick Reference Specification Book
