When do you change timing belt on Audi a4 tdi?

The timing belt on an Audi A4 TDI should typically be changed every 100,000 to 120,000 miles, or approximately every 5 to 7 years, depending on the specific model and engine variant. It's essential to consult the owner's manual for your particular vehicle year for the manufacturer's recommendations. Signs of wear, such as cracks or fraying, may indicate that it should be replaced sooner. Regular maintenance is crucial to avoid potential engine damage.