KNOWN FAULTS · Ford

Ford Focus (IV) 1.0 EcoBoost mHEV common problems.

2018–2025 · Hybrid

Sources are not verified in real time and no entry confirms that your car is affected.

2 known faults with sources

Applies if: Weak points of this model from inspections, breakdown statistics and recalls; anything specific to one engine is stated in the sheet.

Electronics, driver aids and campaigns on the Focus IVElectrical and electronic systems

Engine / equipment: Ford Focus IV (petrol, mHEV, ST and diesel)
Period mentioned: 2018 onwards
Symptoms: Traffic-sign recognition showing wrong limits, parking sensors, Sync 3, stop-start, auto hold and flat batteries; windscreen trims that come loose and the panoramic-roof seal.
Possible cause described: The guide rates the engines as reliable. Recalls: rear-lock spring (child lock), a brake-pedal bolt that could break, an automatic-gearbox stud rubbing the wiring (21/3/2018–7/3/2019) and the 2.0 diesel automatic wiring (31/7/2019–4/3/2020), both with possible engine stalling.
Check for the garage: Check the campaigns by VIN (especially the brake pedal); ask for software updates.
Cost cited in the source: No verified estimate; ask the garage for a quote.A rough figure from the original database, not an up-to-date quote.

Applies if: Same three-cylinder 1.0 EcoBoost with an oil-bathed belt, here with a 48 V mild-hybrid system.

1.0 EcoBoost wet belt: blocked oil pumpEngine

Engine / equipment: 1.0 EcoBoost three-cylinder with oil-immersed belts
Period mentioned: Approx. 2014–2021
Symptoms: Low oil-pressure warning just before a loss of power; sometimes the engine seizes without warning. With no oil pressure the vacuum pump that assists braking can also stop working.
Possible cause described: The oil-immersed belt material can degrade and shed debris that blocks the oil-pump pickup screen; the tensioner arm can also break. The US agency (NHTSA) is investigating almost 136,000 cars; most failures happened before the belt-change interval.
Check for the garage: With the oil-pressure warning, stop and do not restart. At the garage, check the belt and tensioner and look for debris in the sump and pump screen; use the exact oil Ford specifies and do not stretch the change intervals.
Cost cited in the source: No verified estimate; ask the garage for a quote.A rough figure from the original database, not an up-to-date quote.