The manufacturer recommends replacing the belt every 45 thousand kilometers or every 2 years (whichever comes first). Regularly check the tension of the timing belt and adjust if necessary. When the tension is loosened, the belt teeth wear out quickly, in addition, the belt may jump on the toothed pulleys of the crankshaft and camshaft, which leads to a violation of the valve timing, loss of power, and engine damage.
Replacing the belt and tension roller is described in subsection «Replacing the timing belt and tensioner pulley».