The replacement interval for a 1.6 TDCi diesel camshaft belt (timing belt) varies depending on the specific vehicle manufacturer and model year.
There is no single answer. It's
crucial to consult your vehicle's owner's manual. This manual will provide the manufacturer's recommended replacement interval, usually specified in miles or kilometers and/or years.
Failing to replace the timing belt at the recommended interval can lead to catastrophic engine damage, requiring a very expensive repair. Don't rely on general advice; always check your owner's manual.