VW Polo 9n3

Recently bought a 2009 polo 9n3, 81,000 miles on the clock. Was wondering if I should get the timing belt replaced as a precaution. The car has full service history but no evidence to suggest that this work has ever been done on it. Thanks.

Side note: I was out driving today and the exhaust system fault light came on, anyone have an idea what this could be? I’m taking it in to the mechanic in the morning.

1.2 litre, 3 cylinder petrol.