Question 1

What is the Powershift Gearbox Failure issue on the Ford S-MAX Mk1?

Accepted Answer

The 6DCT450 wet-clutch Powershift automatic requires fluid changes every 3 years/37,500 miles. If missed, the internal plastic damping springs shatter and destroy the mechatronic unit. Symptoms include: Harsh gear changes, Loss of reverse, "Transmission Limited Function" message on dash. Estimated repair cost: £1,500–£3,000.

Question 2

What is the Steering Rack Failure issue on the Ford S-MAX Mk1?

Accepted Answer

The power steering rack can leak fluid internally into the track rod end boots, eventually running the pump dry and ruining the rack. Symptoms include: Heavy steering, Whining noise from the power steering pump, Loss of fluid from the reservoir. Estimated repair cost: £500–£1,000.

Question 3

What is the Dual Mass Flywheel (DMF) Wear issue on the Ford S-MAX Mk1?

Accepted Answer

The S-Max heavy body puts extra strain on the DMF. Symptoms include rattling at idle especially cold, vibration through the pedals and difficulty engaging gears. Some owners report failure as early as 60,000 miles on cars used in stop-start traffic. Symptoms include: Metallic rattle at idle with clutch pedal up, Judder when moving off, Vibration through clutch pedal. Estimated repair cost: £800-£1,500.

Question 4

What is the DPF Clogging and Vaporiser Failure issue on the Ford S-MAX Mk1?

Accepted Answer

Short urban journeys prevent DPF regeneration. The fuel vaporiser can fail and the differential pressure sensor is a common secondary failure. Without the vaporiser working the DPF cannot regenerate and will eventually clog completely. Symptoms include: DPF warning light, Reduced power or limp mode, Engine malfunction message, Frequent regeneration fan noise. Estimated repair cost: £250-£1,500.

Question 5

What is the Power Folding Seat Mechanism Failure issue on the Ford S-MAX Mk1?

Accepted Answer

The 2nd and 3rd-row seats fold flat electrically via motors in the seat bases. These motors can fail, the mechanisms can jam and the wiring in the seat channels can fracture. A non-folding third row reduces the car key practical advantage. Symptoms include: Seats will not fold or unfold electrically, Grinding noise from seat motor, One side folds but the other does not. Estimated repair cost: £200-£600.

Question 6

What is the Coolant Leaks (Thermostat and Hoses) issue on the Ford S-MAX Mk1?

Accepted Answer

The thermostat housing, expansion tank and coolant hoses are common leak points as the car ages. Gradual coolant loss can lead to overheating if not caught early. The 1.6 EcoBoost models are also subject to the cylinder-head cracking recall. Symptoms include: Low coolant warning, Sweet smell from engine bay, Pink staining around hoses or expansion tank. Estimated repair cost: £80-£900.

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