It will never break. Reason being is that the 2005 Ford Focus has a cam chain and not a belt. The cam chain is designed to last the life of the engine.
Typical cam belt change interval is 70,000 miles
newer it,s a chain
its a chain in petrol and a rubber belt in diesel
100k miles
I did mine at 100,000 miles. They recommend every ten years or 100,000 miles. It is a pain to get to and you will need to replace several seals if you do it yourself.
it has a cam belt friend
when do you change cam belt and when do you change timing change
Cam chain
2000 ford focus with air n twin cam 4 cyclinder serpentin belt diagram
Every 100,000 Kilometers.
There is an easy way to tell if your Ford Focus is a single or dual cam shaft. If it is single, it will have one gear with a belt around it.