Hi Toni,

We assume you mean a 2013 model based on "YB63" being the start of your UK registration plate. However, the Fabia was available with many different engines in that year, some with belts, some with chains. The diesels use cam belts, as does the 1.4-litre petrol engine, while the 1.2-litre and 1.6-litre petrol engines use timing chains.