Ford Focus

The Zetec-SE is an interference engine: if the timing belt snaps, pistons meet valves. Ford's specified change interval is 150,000 km; 100,000 km is the recommended practice. Replace all idlers and the tensioner at the same time.

Symptoms: Sudden engine shutdown without warning, loud bang on failure, severe engine damage

Individual ignition coils (pencil coils) of the Zetec-SE/Sigma block fail at higher mileages. Symptoms often appear at 1,500–2,500 rpm under load. BERU aftermarket coils are more reliable than some OEM options.

Symptoms: Stumbling and torque loss at 1,500–2,500 rpm, engine control fault code P030x, rough idle

The 1.4 Zetec-SE with variable cam timing suffers from contamination of the non-replaceable integrated VCT filter in the cylinder head. Metal particles from the valvetrain block the filter, causing cold-start misfiring.

Symptoms: Judder and power loss on cold start, engine warning light, rough running until operating temperature

The plastic thermostat housing becomes brittle from heat cycling and vibration, developing hairline cracks. Coolant loss leads to overheating if ignored. Primarily affects Focus Mk1 with the 1.6 Zetec-S.

Symptoms: Coolant level drops without visible ground leak; temperature gauge fluctuates or climbs into the red zone; coolant smell from the engine bay.

Sills and rear wheel arches rust from the inside out. Vehicles from approximately 150,000 km often have widespread corrosion. Always check with a magnet before buying.

Door lower edges and tailgate frequently show early rust spots, particularly at seal contact areas. Water collects in the folds and attacks the metal.

Water enters through a faulty windscreen seal on the passenger side. The pollen filter box can overflow and the passenger footwell carpet becomes wet. Risk of mould.

Rear brake callipers or drum brakes tend to seize, especially after extended periods standing. Brake discs and pads wear unevenly.