Ford Focus

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.

Vehicles with 6-speed manual gearbox and 1.0/1.5/1.6 EcoBoost (Aug 2012–Jun 2016) were recalled due to faulty clutch pressure plates. In some cases a complete clutch replacement was required.

The PTU of the GKN all-wheel drive system has no active cooling. Above 150°C the system switches to FWD. TSB 5461 for oil leaks 2016–2017. An aftermarket cooling kit is strongly recommended for track use.

The GKN torque-vectoring rear differential (RDU) of the Focus RS Mk3 requires fresh specialist oil every 48,000 km. Neglecting this causes the clutch plate packs to overheat and the gears to wear prematurely.

Springs and shock absorbers are frequently flagged at inspection. The sportily tuned suspension of the MK3 wears chassis components more rapidly than its predecessor.

The Getrag six-speed shows synchromesh wear in 2nd and 3rd gear at higher mileages. A gearbox oil change with specialist fluid can delay early failure. Repair 1,500–3,000 EUR.

Rear wheel arch openings rust at the bumper transition edge. The roof above the rear doors can deform through body torsion. Boot water ingress through leaking spoiler fixings is widespread.

Launch control and drift mode put enormous strain on the clutch. Replacement including labour over 1,000 EUR. Clutch test: 5th gear, 50 km/h, full throttle — if revs rise without vehicle accelerating, the clutch is worn.

The standard 350×25mm one-piece discs on the Focus RS Mk3 overheat with aggressive driving and warp. Particularly after track days or hard mountain passes. Noticeable as pedal vibration under braking.