when do i renew my cam belt on my mercedes a160?

when do i need to renew my cam belt on my mercedes a160 ie what mileage? it has done 71,000 miles 1.6 engine and the car is an x reg.
amanda, August 2007
You don't have to Amanda. The A class has a timing chain and they are good for the life of the engine.

wayne jenkins, January 2008
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