Ford C-Max
Ford 1.6L Ti-VCT (Sigma) 105/125 hp. Focus III DYB and facelift. NA petrol. Also MUDA, XTDA variants for different outputs.
Reliable Van
The C-Max DXA with 125 hp diesel is well-motorised for its size. Family everyday life trouble-free.
Engine Weaknesses 6
The 1.6 Ti-VCT has narrow oil drillings in the cylinder head (production up to 2007). The phaser oil-logs and rattles on cold start. Ford improved the design from spring 2007; older engines more frequently affected.
Symptoms: Diesel-like rattle on cold start that disappears after warm-up; power drop under hard acceleration
The Sigma/Ti-VCT pencil coils fail at around 100,000–140,000 km. Typical at 1,500–2,500 rpm under load. Aftermarket coils (BERU) are considered more reliable than cheap own-brand units.
Symptoms: Misfires and power loss at mid-range RPM, OBD fault code P030x, rough running
The Ti-VCT cam phaser in the 1.6L naturally aspirated Focus DYB can seize from oil sludge deposits. A blocked oil filter in the cylinder head prevents variable adjustment. Short oil change intervals reduce the risk.
Symptoms: Check engine light P0011/P0014, slight power loss when warm, rattle on cold start
The plastic thermostat housing becomes brittle from heat cycles and vibrations and develops hairline cracks. Coolant loss leads to overheating if ignored. Particularly affects Focus Mk1 with 1.6 Zetec-S.
Symptoms: Coolant level drops without visible puddle; temperature gauge fluctuates or rises into red; coolant smell in engine bay.
The electronically controlled thermostat of the Ti-VCT is prone to failure: housing ears break off, the valve no longer closes fully. Engine stays below operating temperature, fuel consumption rises.
Symptoms: Temperature gauge permanently low, heater delivers little warmth, increased fuel consumption
The idle control valve on the underside of the intake manifold clogs with deposits. Typical age-related issue on the 20-plus-year-old Zetec-S engines in the Focus Mk1 and Fiesta Mk5.
Symptoms: Rough, hunting idle; engine stalls when braking or at traffic lights; RPM hunting between 600 and 900 rpm at idle.
Vehicle Weaknesses 6
The catalytic converter of the 1.0 EcoBoost engine in the C-Max Mk2 typically fails prematurely after 70,000–80,000 km. The cat integrated into the exhaust manifold is especially at risk from the intense thermal loading of the three-cylinder. Replacement is complex and expensive.
ADAC breakdown data shows that C-Max Mk2 models from 2010–2013 were stranded with flat batteries and failed alternators more frequently than average. Stop-start systems place particular strain on the battery.
On the C-Max DXA (Grand C-Max), the air conditioning fails intermittently and stops cooling. Often only a restart of the engine helps. Software updates frequently only fix the problem temporarily.
On the Grand C-Max DXA, the A-pillar seals can leak, allowing water to enter the cabin in heavy rain. The repair is complex and requires several days in the workshop.
On the Grand C-Max, the 'Service required' message repeatedly appears in connection with the child lock on the sliding doors. Despite the child lock being active, the doors intermittently fail to function correctly.
The C-Max Mk2 regularly fails inspection with worn shock absorbers, faulty headlights and lighting, and worn steering joints. Older examples from 100,000 km often have several defects simultaneously.