Check out seatcupra dot net for more information about common faults. I have a diesel Leon and AC fans tend to fail and are pricy to replace (mine cost £440). Check for fans pulsing on and off when the AC is on auto.
Don't buy a yellow one - the paint fades (mine has) due to poor UV protection in the clear topcoat.
Check for water ingress into footwells if possible - door seals fail (but easy enough to fix yourself).
Not sure about 1.8T-specific faults, but there's plenty on the forum above.
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