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for po455 most likely cause is the purge valve, 2181 is a thermostat and 0480 the large fan needs to be replaced, three separate issues
are you asking for step by step directions n how to replace the components?
I'm going to opt out and see if another professional can help you, it is not legal for me to publish repair manual info from the VW server
The EVAP purge valve is the P0455 fault and is causing your starting issues- the valve is sticking slightly open, causing fuel vapors to flood into the intake when filling the tank. It is a small black plastic cylinder, with a rubber hose leading out each end, and an electrical connector. It is mounted right along the fuel rail, more toward the passenger side of the engine.
The P0480 is related to the fan control module, which is actually part of the larger (main) electric fan. You need to remove the entire fan housing with both fans from the backside of the radiator, and then unbolt and replace the fan. There are 4 10mm bolts holding the housing on, but you will need to wiggle and angle the housing in order to get it out, and it has to come out the bottom, so only if you have the car on a hoist or are able to lift it and have enough clearance to drop it out that way.
The Thermostat is actually replaced as a whole housing now, it is under the intake manifold and relatively difficult to get to unless you can come at it from the bottom
You'd be best off talking to a parts counter expert at the dealership- while I install the parts, they look them up for me. And often part numbers get superceded as updates are available.