Ford B-Max
Ford 1.4L Duratec 16V (Sigma) 90 hp. Used in B-Max 2012-2017.
Diesel Too Weak
90 hp diesel in the mini-van: fine in the city, motorway driving lacks reserves. No excitement.
Engine Weaknesses 6
Sigma/Duratec 16V engines are interference engines with a timing belt. Ford quotes 150,000 km service interval; workshops recommend 100,000 km. A skipped or snapped belt causes total engine destruction.
Symptoms: No prior warning — sudden engine stall and engine damage if belt snaps without replacement
The pencil ignition coils in the Sigma/Duratec 16V family fail at around 100,000–140,000 km. Problems appear mainly at 1,500–2,500 rpm under load. Aftermarket coils (BERU ZS350) are considered more reliable.
Symptoms: Hesitation and torque loss in the mid-rev range, fault code P030x, rough engine
The 1.4 Duratec SFDB shows typical oil consumption at higher mileages due to age-hardened valve stem seals. Blue smoke after overrun phases and slight oil consumption are typical signs.
Symptoms: Blue smoke on cold start or after prolonged overrun, slightly increased oil consumption with no visible leak
Thermostats in the Sigma/Duratec family frequently stick in the open position. The engine never reaches operating temperature, cabin heat is minimal. Easy and inexpensive to replace.
Symptoms: Temperature gauge remains permanently low, barely any cabin heat, increased fuel consumption
The individual ignition coils on the 1.25 Duratec fail frequently from 80,000–110,000 km. Hesitation and misfires in the mid-rev range are typical; coils and spark plugs should be replaced together.
Symptoms: Hesitation on acceleration between 1,500 and 2,500 rpm, rough engine, check engine light, noticeable power loss
On the Ford 1.25/1.4 Duratec (Sigma) the valve cover gasket starts to leak from around 80,000 km. Oil drips onto hot engine components, producing a burning oil smell and in the worst case a risk of engine fire.
Symptoms: Burning oil smell from engine bay, visible oil residue on valve cover, slight oil loss at spark plug gallery
Vehicle Weaknesses 6
Inspection reports show that older B-Max models are flagged for defective springs and dampers more than twice as often as the average. Steering joints also wear quickly. Typical after 80,000–120,000 km.
According to inspection data, the B-Max regularly receives advisories for worn steering joints and track rod ends. Premature wear leads to steering play.
The rubber seals on the rear sliding doors work loose or tear over time. The guide rails collect sand and leaves, causing scraping noises and sticking. Regular lubrication with silicone oil is essential.
Older B-Max examples fail inspection with a rusty exhaust system more often than average. Damage is concentrated in the middle and rear sections of the exhaust. Typical from seven years or 100,000 km.
Electric window regulators in the B-Max fail, particularly the rear ones. The plastic guide rails for the glass break or the motors give up. The problem is widespread from 60,000–100,000 km and primarily affects the rear doors without a B-pillar.
The stop-start system frequently fails due to a weakening starter battery, especially in short-trip drivers. The fault occurs sporadically and highlights the limits of the AGM battery.