Ford Fiesta
Ford 1.25L Duratec 16V (Sigma family). 75 hp (55 kW) and 82 hp (60 kW) in Fiesta Mk6 JH and Mk7 JA8. Reliable and easy to maintain, typical city-car engine.
Solid City Companion
The 1.4 with 75 hp handles everyday duties without fuss. Fine if you have no sporting ambitions.
Engine Weaknesses 6
Sigma/Duratec 16V engines are interference engines with a timing belt. Ford quotes 150,000 km service interval; workshops recommend 100,000 km. A skipped or snapped belt causes total engine destruction.
Symptoms: No prior warning — sudden engine stall and engine damage if belt snaps without replacement
The pencil ignition coils in the Sigma/Duratec 16V family fail at around 100,000–140,000 km. Problems appear mainly at 1,500–2,500 rpm under load. Aftermarket coils (BERU ZS350) are considered more reliable.
Symptoms: Hesitation and torque loss in the mid-rev range, fault code P030x, rough engine
Thermostats in the Sigma/Duratec family frequently stick in the open position. The engine never reaches operating temperature, cabin heat is minimal. Easy and inexpensive to replace.
Symptoms: Temperature gauge remains permanently low, barely any cabin heat, increased fuel consumption
The 1.25 Duratec shows increased oil consumption at higher mileages due to worn piston rings or valve stem seals. Up to 1 litre per 1,000 km is documented.
Symptoms: Blue exhaust smoke at high rpm or under load, oil level dropping between services, oil smell from exhaust.
The individual ignition coils on the 1.25 Duratec fail frequently from 80,000–110,000 km. Hesitation and misfires in the mid-rev range are typical; coils and spark plugs should be replaced together.
Symptoms: Hesitation on acceleration between 1,500 and 2,500 rpm, rough engine, check engine light, noticeable power loss
On the Ford 1.25/1.4 Duratec (Sigma) the valve cover gasket starts to leak from around 80,000 km. Oil drips onto hot engine components, producing a burning oil smell and in the worst case a risk of engine fire.
Symptoms: Burning oil smell from engine bay, visible oil residue on valve cover, slight oil loss at spark plug gallery
Vehicle Weaknesses 7
Front springs break through rust at the lowest coil, often without warning. Ford offered a ten-year warranty on the springs. The car sags at the front and may rub on the tyre.
Door lower edges rust due to poor cavity sealing, especially on vehicles up to 2004. Sills and wheel arches are at risk. Springs rust at the lowest coil and break.
EAC faults caused by moisture at wiring loom connectors. Engine runs in limp mode or does not respond to the throttle. Contact spray and possibly new ignition coils required.
The A/C condenser sits unprotected at the front of the car and is vulnerable to stone chip damage. Refrigerant escapes and the air conditioning no longer cools.
Leaking third brake light, rear screen seal or door seals let water into the boot. Wet spare wheel well and mould growth in the luggage compartment are typical consequences.
Water enters through the third brake light, rear wiper unit, or damaged rear screen seal into the boot. The spare wheel well fills with water.
The AC condenser is inadequately protected against stone chips and frequently develops leaks. The air conditioning loses refrigerant and stops cooling. Particularly common on vehicles over 100,000 km.
Reports & Tests
2 owner complaints filed with NHTSA (2001–2008). Most reported: Latches & Locks (1), Powertrain (1).