If it is the 1.6 HDI 110 bhp model then the cam belt needs changing every 150 thousand miles
both a belt from cam to crank and a chain between the two cams
On the Peugeot 207 1.6 HDi, the timing belt is recommended to be replaced after 10 years or 100,000 miles.
£375.00 fitted by Peugeot incl water pump
You can do this by getting the right parts. You can find these at an automotive store in your area.
The Peugeot garage told me 80,000 or 8 years whichever is first
Peugeot 207 1.6 hdi cambelt change when is it due?
Cam belt changed at the 96,000 mile service on my 03 plate 2.0 hdi (90hp)
Peugeot recommend change at 96,000 miles under normal conditions 80,000 miles under adverse conditions.
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93000 mls or after 10 yrs whichever comes first.