See more from Ask Carzone 
When to change my Focus's belt?
When to change timing belt on Ford Focus 2015 Zetec diesel.
Our answer:
Hi Ann,
Assuming you mean the 'new' shape Focus that launched that year, and the 1.6 TDCi diesel engine, then it's at least every 180,000km or ten years - whichever comes first.
Have a motoring question? Ask us here!
Ask us anything motoring related and please provide as much information as possible so we can give you the most accurate advice.