FORD Focus – Purchase advice

Hello all, I would have to buy a used car until about 2,000 euros. Whether diesel or petrol is not so important to me. But a green badge would have to have the car, because I live in the Ruhr area. Dieselers up to 2,000 euros is hard to find or not at all, with green badge. That’s why it will be a gasoline, I think. What must be considered at the used Ford Focus? I wanted to buy one with 1.6 engine, from year 2001. Does petrol turbocharger? Toothbelts? What must I buy? What about the KM performance? At 2000 Euro, Dr. KMStand is at about 180,000. How long does a Ford gasoline engine last? Thanks to everyone in advance.