Ford C-Max
Stronger 125 hp variant of the 1.0 EcoBoost Fox block. Turbo with higher boost pressure, otherwise identical construction to M1DA. Same wet-belt issues; also switched to chain drive from mid-2018.
Adequate Van
100 hp EcoBoost is sufficient for family everyday life in the C-Max DXA. No excitement, but trouble-free.
Engine Weaknesses 6
The oil-bath timing belt degrades with incorrect oil type or overdue change intervals. Rubber fragments block the oil strainer and endanger the oil pump and connecting-rod bearings.
Symptoms: Unusual noises from engine bay, engine warning light, in the worst case engine seizure from oil pressure loss.
The plastic fitting on the turbo coolant hose at the expansion tank becomes brittle and fractures. Rapid coolant loss can overheat the engine in minutes and cause irreparable damage.
Symptoms: Visible coolant loss, steam rising from engine bay, temperature warning. Coolant level drops rapidly.
The 1.0L EcoBoost uses an oil-bath timing belt for the oil pump drive. With incorrect oil type or overdue oil changes the belt disintegrates and leads to engine damage. Exact oil type (Ford 5W-20) and strict adherence to change intervals are mandatory.
Symptoms: Oil pressure warning light, engine noise, in extreme cases engine failure without prior warning
The front cover seal on early 1.0 EcoBoost engines (up to approx. February 2015) was not oil-resistant. Oil attacks the seal, causing gradual coolant loss. TSI 15-1070 addresses the problem.
Symptoms: Coolant level drops without visible external leak, temperature warning, whitish steam from engine bay.
The integrated catalyst on the 1.0 EcoBoost fails relatively early. Fault code P0420 appears in the fault memory; increased emissions and potential MOT issues follow.
Symptoms: Engine warning light with code P0420, slightly increased fuel consumption.
The wastegate actuator rod on the small turbocharger vibrates due to a leaking vacuum actuator. Leads to power loss and fault code P0299 (underboost).
Symptoms: Rattling noise from turbo area, noticeable power drop, fault code P0299, engine in limp mode.
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.