This is a DIY for the Charcoal Canister and Leak Detection Pump on a B8 Audi A4. I had a CEL code P0455 for an evap leak (you may have a different code for the same issue P0456) and also noticed when filling up gas, the pump would click as if the tank was full although it wasn't (pressure build...
This will help you and also guide you with the tools you need.
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