Ford Fiesta
Ford 1.25L Duratec (Sigma family) 60 hp. Used in Fiesta JH (Mk5/Mk6) and B-Max 1.4.
Too Few Horses
Under 60 hp in the Fiesta: only suitable for city driving. No pleasure, but a cheap entry point.
Engine Weaknesses 6
Sigma/Duratec 16V engines are interference engines with a timing belt. Ford specifies 150,000 km change interval; workshops recommend 100,000 km. A skipped or tensioned belt results in total engine loss.
Symptoms: No warning symptoms — sudden engine shutdown and damage if belt breaks without replacement
The pencil coils of the Sigma/Duratec 16V family fail at around 100,000–140,000 km. Problems mainly occur at 1,500–2,500 rpm under load. Aftermarket coils (BERU ZS350) are considered more reliable.
Symptoms: Misfires and torque loss at mid-range RPM, fault code P030x, rough running
The 1.25 Duratec in the Fiesta JH can suffer camshaft wear if oil change intervals were not observed. Insufficient hardening of lobe contact surfaces is known on early units.
Symptoms: Clattering from the valvetrain, rough running especially when cold, power loss at high RPM
The electronic throttle body on the 1.6 Duratec (e.g. Focus Mk2 petrol) frequently fails above 150,000 km from potentiometer wear or moisture. Fault codes P2108 and P2176 appear; the OEM unit costs £480.
Symptoms: Sporadic engine fault warning, engine won't accept throttle, idle hunting, intermittent stumble on pull-away
Sigma/Duratec family thermostats frequently stick in the open position. The engine fails to reach operating temperature, the heater barely works. Simple and cheap replacement.
Symptoms: Temperature gauge permanently low, barely any heater warmth, increased fuel consumption
Individual ignition coils in the 1.6 Duratec also fail repeatedly. Multiple successive failures are commonly reported. Replacing all coils and spark plugs together saves follow-up costs and prevents catalytic converter damage.
Symptoms: Misfires and engine hesitation on acceleration, ignition misfire sounds, check engine light, increased fuel consumption
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).