EcoBoost 1.6 vs Sigma 1.25
Side-by-side reliability comparison
Specifications
Character
EcoBoost 1.6
"Ford's first four-cylinder EcoBoost (2010-2017): 1.6 litres, direct injection, turbo, timing belt. Fitted to the Focus III, C-Max II, Kuga II, Fiesta ST and ST200, Mondeo, S-Max, Galaxy, Transit Connect and, as the B4164T, to Volvo T3/T4 models. Strong and lively, but very sensitive to coolant loss: with too little coolant the cylinder head can overheat and crack, leak oil under pressure and, in rare cases, start an engine-bay fire. Ford recalled engines built 2010-2014 worldwide (845 cars in Greece) to fit a coolant level sensor. Check the recall was done, watch the coolant level and change the timing belt on time."
Sigma 1.25
"Fiesta 1.25 16V (Zetec-SE, later Duratec), also Fusion and Mazda2. Simple, light engine co-developed with Yamaha. The camshafts are driven by a timing belt, so keep to the replacement schedule. Known faults are minor: ignition coils or leads causing misfires, and cooling-system leaks such as the thermostat. Slow but cheap to run."