Ford Fiesta

The 1.6 Ti-VCT has undersized oil drillings in the cylinder head (pre-2007 production). The VVT phaser fills with oil and rattles on cold start. Ford revised the design from spring 2007; earlier engines are more commonly affected.

Symptoms: Diesel-like rattle on cold start that disappears after warm-up; power drop under hard acceleration

The Sigma/Ti-VCT pencil-type ignition coils fail around 100,000–140,000 km. Typical at 1,500–2,500 rpm under load. Aftermarket coils (BERU) are considered more reliable than budget brands.

Symptoms: Juddering and power loss in the mid-rev range, fault code P030x on OBD, rough idle

The 1.6 Ti-VCT HXJB shares the known weakness of undersized oil drillings in the camshaft adjusters. Oil deposits block the oil pressure flow and lead to rattling and power loss.

Symptoms: Rattling or clattering on cold start, power loss at low revs, occasional OBD fault codes for camshaft position.

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

Symptoms: Coolant level drops without visible puddle on the floor; temperature gauge fluctuates or climbs into the red; coolant smell from the engine bay.

Brake lines and fuel lines corrode faster than comparable competitors. TÜV inspection failures due to brake line corrosion are common. Leaking lines are a safety-critical issue.

Brake lines corrode faster than on comparable competitors. On older vehicles there is a risk of line fractures, which can cause complete brake failure. Check thoroughly before buying.

Rear springs break through corrosion at the lowest coil, similar to the predecessor. Shock absorbers leak prematurely and ride quality deteriorates.

A defective auxiliary heater relay results in inadequate cabin warming. The heater blows little or no warm air in cold temperatures. Solution: relay replacement per TSI 70/2010.