How do you change a cambelt on vw sharan 19 dti?

To change the cambelt on a VW Sharan 1.9 TDI, first, ensure the engine is cool and disconnect the battery. Remove the engine cover, and then align the timing marks on the crankshaft and camshaft to ensure proper timing. Next, loosen the tensioner and remove the old cambelt, replacing it with the new one, ensuring it is properly tensioned. Finally, reassemble all components, double-check timing alignment, and reconnect the battery.