Ford Focus
134 kW variant of the 1.5L EcoBoost in the Focus DEH. Same open-deck block as M9DA, same TSB issues up to 2019. Higher boost pressure adds additional thermal stress.
Everyday Diesel Mk4
Solid 150 hp, decent chassis. A sensible choice for commuters without emotional requirements.
Engine Weaknesses 6
Open-deck liner structure cracks from thermal expansion. Coolant ingress into combustion chambers causes severe engine damage. Ford TSB: short block replacement. Revised block from mid-2019.
Symptoms: White exhaust smoke, coolant loss without external leak, rough cold start, oil-coolant mixing.
The 1.5 EcoBoost is prone to head gasket sealing issues. Coolant loss without visible external leak is an early warning sign. In confirmed cases gaskets have failed from as low as 34,000 km.
Symptoms: Coolant level drops without external leak, white exhaust smoke, engine overheats on long runs
Early 1.5 EcoBoost four-cylinder engines (up to approx. March 2019) are prone to hairline cracks in the cylinder block. Coolant enters the cylinders and causes severe engine damage. Short block replacement required.
Symptoms: Rough cold start, white exhaust smoke, coolant loss without external leak, engine warning light.
Individual 1.5 EcoBoost engines show piston ring fractures from as low as 35,000 km. The affected cylinder loses compression completely; short block replacement required.
Symptoms: Sudden power drop, heavy juddering or engine stall, measurable compression loss in one cylinder.
Boost control solenoid or wastegate can cause boost instability. Occasional P0299 codes particularly at higher mileage.
Symptoms: Code P0299, power loss under load, engine enters limp mode.
Direct injection causes carbon deposits. More pronounced under higher power demands.
Symptoms: Stumbling on cold start, power loss, increased consumption.
Vehicle Weaknesses 6
Recall for 9,858 vehicles (Oct–Dec 2018) due to bolts at the brake pedal-to-master cylinder connection being at risk of fracture. Complete brake failure is possible.
Cracking and squeaking from the electric steering on parking manoeuvres. Isolated cases of steering failure with a warning message on cold start. Usually resolved under warranty.
On the 155 hp MHEV variants with manual gearbox, the synchro rings for 1st and 2nd gear wear prematurely. Failures documented from as low as 22,000 km. Ford does not offer improved replacement parts.
Early 2018–2019 model years had significant electrical issues: failed parking sensors, a faulty SYNC 3 system, defective stop-start and Auto Hold functions. Software updates resolve many problems.
The underbody has inadequate corrosion protection: weld seams unsealed, cavities open. Rust forms early in splash zones. The exhaust system corrodes quickly.
The SYNC 3 system freezes regularly on early DEH models (2018–2020), stops responding to touch input or shows a black screen. Software updates improve the issue.
Reports & Tests
800 owner complaints filed with NHTSA (2018–2024). Most reported: Powertrain (302), Engine (221), Fuel System (123).