I had that fault code on my Cupra last year, its the EVAP system. Firstly i changed the EVAP valve (cant quite remember the valve number) which was the cheapest fix but wasnt successful so changed the charcoal canister and that sorted the problem. The valve was around £25 and the canister around £85 iirc. Dave from SERE sorted me out.
Spoke too soon the lights on again. Looks like ill be ringing the dealer that sold me the car to get him to replace it under warranty.