Ford Focus: common faults & what to check

Can't confirm for this car

The Mk3 Focus ST's 2.0 EcoBoost can consume coolant internally. Ford's service message SSM 47462 covers 2015-2018 Focus (and other 2.0 EcoBoost models) with coolant consumption, white smoke and rough running, and tells technicians to look for erosion and pitting between the cylinder bores on the head and block. UK specialists also report cracks inside the head's water jacket around the exhaust port, which show as white smoke through the turbo and cannot be repaired. Heavily tuned cars are at higher risk. Left alone it leads to overheating, hydrolocking or a failed engine.

Example of the part — not this vehicle

Where to look: Engine bay: cylinder head and head gasket between the bores, coolant expansion tank, turbo on the exhaust side

Parts involved: Cylinder head, Head gasket.

Can't confirm for this car

The four-cylinder 1.6 EcoBoost (found in UK-import Mk3s) and the 1.5 EcoBoost that replaced it in the LZ facelift can lose coolant internally. On the 1.6, running low on coolant lets the head overheat locally and crack, leaking oil onto the turbo and exhaust; Ford UK recalled 2010-2015 Focus, Kuga and C-Max 1.6 EcoBoost in January 2018 to fit a coolant level sensor and warning. On the 1.5, coolant seeps into the cylinders, giving white smoke and misfires; Ford's service message SSM 48106 for the same engine in the Fusion/Mondeo calls for a new short block when a pressure test and borescope confirm it, and the US class action Miller v Ford (2025) covers these engines. Ignored, either version ends in a destroyed engine or an underbonnet fire.

Example of the part — not this vehicle

Where to look: Engine bay: coolant expansion tank, cylinder head and turbocharger on the exhaust side of the engine

Parts involved: Cylinder head.

Can't confirm for this car

The 1.5 EcoBoost in facelifted Mk3 Focuses shares the EcoBoost family's coolant-intrusion weakness: coolant seeps past the head gasket into the cylinders, starting as slow unexplained loss and ending in misfires, bore corrosion and engine replacement. It is covered by the same US class action as the 1.6/2.0 versions. Slow coolant loss on one of these is never 'just a top-up' — walk away or price in an engine.

Where to look: Head gasket/block deck inside the engine; evidence at coolant tank and tailpipe

Parts involved: Head gasket, Body corrosion.

Can't confirm for this car

The 2.5 turbo five-cylinder uses press-fitted steel liners in an open-deck block, and liners can crack - rare on a standard engine, markedly more likely on cars tuned past about 240 kW, run with aggressive aftermarket maps, or driven with unresolved coolant leaks. Symptoms are a misfire when cold, unexplained coolant loss, white smoke and rough running on start-up. Specialists report pre-April-2008 engines as the most affected, though it has been seen across all years. A cracked liner means an engine rebuild or replacement, so on a modified XR5 this is the single most expensive risk on the car.

Where to look: Inside the engine block - cylinder liners of the 2.5-litre five-cylinder

Parts involved: Turbocharger.

Can't confirm for this car

Unconfirmed. This entry does not match our record of which engines and years this model was sold with, and is awaiting review. Confirm it against the car before acting on it.

The 1.8L Duratorq TDCi diesel in Focus LT and LV models uses a rubber timing belt on an interference engine — belt failure causes piston-to-valve contact and total engine destruction with no warning. The tensioner pulley is a documented failure point and can seize without warning if not replaced on schedule. Ford's official interval is 10 years or 125,000 km, but NZ independent mechanics recommend 100,000 km or 8 years given the interference design and the cost of engine failure.

Where to look: Front of engine, behind the timing belt cover on the auxiliary belt side

Parts involved: Timing belt.

Can't confirm for this car

Ford Australia recalled 4,277 Focus built between 21 May 2013 and 24 January 2014 (PRA 2015/14925, September 2015) because the front halfshaft wall thickness may be below specification and the shaft can snap, most likely when pulling away from rest. A broken shaft means a bang from the front, total loss of drive, loss of the auto park function and possible damage to nearby components. The fix is free at a Ford dealer, but a car that has changed hands or was imported may never have had it done.

Where to look: Front axle: the driveshafts running from the gearbox to each front wheel

Can't confirm for this car

Ford recalled manual-gearbox Focus built between 17 June 2015 and 16 June 2016 (campaign 18S07, Australian PRA 2018/16755, 2,836 cars; the US version covered the 1.0 EcoBoost with the B6 six-speed). Prolonged clutch slip can overheat the clutch so the pressure plate cracks or breaks, damaging the gearbox casing and letting gearbox oil leak onto hot parts, which is a fire risk. The remedy is software that detects and stops extended clutch slip, plus a new clutch where needed. Cars that missed the recall, or have been driven hard with a slipping clutch, may already have damage.

Where to look: Between the engine and the manual gearbox (bellhousing), front of the car

Parts involved: Clutch.

Can't confirm for this car

Mk2 TDCi diesels wear their dual-mass flywheels — rattling at idle and shuddering take-offs — and a DMF plus clutch is a big job. The same cars, when used mostly around town, block their diesel particulate filters because regeneration never completes, leading to limp mode and forced regens or replacement. A short-tripped urban TDCi combines both bills; these engines want open-road use.

Where to look: DMF between engine and gearbox; DPF in the exhaust under the floor

Parts involved: Clutch, Diesel particulate filter.

Can't confirm for this car

The Mk4's 1.5 EcoBoost three-cylinder drives its camshafts by chain, but the oil pump is driven by a belt running inside the engine oil - a 'wet belt'. Ford's stated replacement is 10 years or 150,000 miles (about 240,000 km), and as these belts age or when oil changes are stretched, the belt sheds rubber that can restrict the oil pickup and drop oil pressure - the same failure family that made the 1.0 EcoBoost wet belt notorious, though the 1.5's record is better so far. The job is labour-heavy because the belt lives inside the engine. Early 2018 cars are now approaching the age where this item is due, and almost no seller has budgeted for it.

Where to look: Oil pump drive belt inside the engine, behind the timing cover at the sump end

Can't confirm for this car

On 2.0 direct-injection petrol Focuses, the evaporative-emissions purge valve can stick open so the engine constantly sucks vacuum through the fuel tank. The result is stalling, hard starts, erratic fuel gauge readings — and in advanced cases the vacuum physically crushes the fuel tank inward. Ford recalled these in North America (18S32) to update software and replace damaged valves/tanks; NZ-new and import cars may never have been done, and a deformed tank is an expensive surprise.

Where to look: Purge valve on the engine near the intake; fuel tank under the rear seat/floor

Can't confirm for this car

The electronic throttle body on Mk2 petrol Focuses fails intermittently: the dash shows an engine malfunction warning, power drops to limp-home mode, and the engine may vibrate or idle badly. Switching the car off for five minutes often resets it, which is exactly how it gets hidden at sale time - the fault is intermittent by nature. The fix is a replacement throttle body. It is well documented on Australian cars and on UK owner forums with codes such as P2100/P2104-series throttle faults.

Where to look: Throttle body on the engine intake, top of the engine bay

Can't confirm for this car

Across Mk1 (coil pack and leads) and Mk2 (coil-on-plug) petrol Focuses, ignition coil failure is the most common cause of misfires, hesitation and a flashing engine light — worst in wet weather. Cheap to fix, but sustained misfiring wrecks the catalytic converter, turning a $200 problem into a $1,500 one. Any rough-running petrol Focus of this era should be assumed to need ignition parts first.

Example of the part — not this vehicle

Where to look: Coil pack with HT leads (Mk1) or individual coils on top of the engine (Mk2)

Parts involved: Ignition coil.

Can't confirm for this car

The Mk1 Focus's idle air control valve gums up with age, causing hunting idle, stalling at junctions and hard starts when warm. It is a cheap clean-or-replace job, but it makes the car feel far sicker than it is — and sellers often let it go rather than diagnose it. A stalling Mk1 Focus is more often a $200 fix than a dying engine, but confirm before you pay for it either way.

Where to look: Idle air control valve on the intake manifold/throttle body, top rear of the engine

Can't confirm for this car

The Mk2 Focus uses an electrically driven hydraulic steering pump that fails with age — steering suddenly goes heavy, sometimes intermittently at first. The pump is dear, and low fluid or the wrong fluid accelerates the failure. Intermittent heavy steering is genuinely dangerous mid-corner, so treat any assistance dropout as a must-fix, not a quirk.

Where to look: EHPAS pump and reservoir low down behind the front bumper/passenger-side inner guard

Parts involved: Steering rack.

Can't confirm for this car

On Mk4 Focuses built September 2018 to May 2019, a transmission stud can chafe through the engine wiring loom. Damage shows as an engine warning light, reduced power, or the engine cutting out entirely. Ford Australia recalled it in September 2020 (campaign 19S50, PRA 2020/18538) and then had to recall the same cars again in May 2021 (20S74, PRA 2021/18939) - a repeat campaign, which tells you the first fix did not always hold. On a used example the questions are whether both campaigns were done and whether the loom already carries repair tape from a previous chafe.

Where to look: Engine wiring loom where it passes the transmission studs, engine bay

Can't confirm for this car

On early Mk3 Focus with the 2.0 GDI direct-injection engine, the engine wiring harness can rub through against the intake manifold near the throttle body, shorting sensor circuits. Ford TSB 15-0036, superseded by TSB 18-2062, covers 2012-2014 Focus 2.0 GDI built up to February 2014 with rough running, crank no-start, loss of power, sudden loss of revs and an engine light with a long list of sensor codes. The repair is to find and splice the damaged wires and re-sleeve the harness, but the fault is intermittent and often misdiagnosed as failed sensors or a failed engine computer, so owners can spend money on parts that do not fix it.

Where to look: Top of the engine, where the main engine harness passes the throttle body and plastic intake manifold

Parts involved: Intake manifold.

Can't confirm for this car

Mk4 Focuses suffer parasitic battery drain from modules that fail to sleep, plus SYNC3 freezes, phantom alarm activations and random warning messages. Ford issued multiple software updates; a car that has not had them will flatten its battery in a week or two of sitting. Diagnosis of a stubborn drain is charged by the hour, so a documented history of updates and one healthy battery beats a car on its third battery.

Where to look: 12V battery in the engine bay; body control module and SYNC unit behind the dash

Parts involved: 12V battery.

Can't confirm for this car

Front wheel bearings on LR–LV Focus models have a documented shorter-than-expected service life on NZ roads, commonly failing between 80,000 and 140,000 km. The hub-integrated bearing is pressed into the steering knuckle and requires a hydraulic press to replace. Premature failure is partly attributed to the relatively heavy front end for a compact car and the road surface quality typical of NZ urban and suburban driving.

Where to look: Front wheel hub, pressed inside the steering knuckle

Parts involved: Wheel bearing.

Can't confirm for this car

The Mk3 Focus was caught in Ford's global door-latch recalls: a cracked pawl spring tab leaves a door that will not latch, or one that pops open over bumps. Replacement latches were fitted free under recall, but coverage of NZ-new and imported cars is patchy. It is a two-minute check that rules out a genuine safety fault.

Where to look: Latch mechanisms in each door shut-face

Can't confirm for this car

Mk2 Focus hatches rust in two specific places: the rear wheel arch lips, where a slightly misaligned rear bumper rubs the paint through, and the tailgate, particularly where the rubber buffer contacts the body and around the tailgate skin. It starts as bubbling under the paint and spreads. On a car this age a clean shell matters more than mechanical niggles - proper rust repair with paint costs more than the panel is worth, and body filler over rust is the classic disguise at sale time.

Where to look: Rear wheel arch lips behind the bumper edges, tailgate skin and its buffer contact points

Parts involved: Body corrosion.

Can't confirm for this car

Ford Australia recalled 2011-2015 Focus vehicles (PRA 2017/16259, August 2017) because dust ingestion can block the carbon canister; during a purge cycle the fuel tank then pulls a vacuum beyond its design limit and can crack and leak petrol - a fire hazard with any ignition source. The recall work is free at a Ford dealer, but it was VIN-specific and issued six years after the first affected cars were sold, so plenty of used examples changed hands without it done. A cracked tank shows up as fuel smell and visible weeping under the rear of the car.

Where to look: Fuel tank and carbon canister under the rear of the car

Can't confirm for this car

Ford recalled 2019-2022 Mk4 Focuses (campaign 22S21, REC-005431, May 2022) because the right-hand engine oil separator may have been damaged before engine assembly. A damaged separator leaks oil, and oil on hot engine parts can smoke or, worst case, ignite. Owners notice an oily smoke smell while driving or smoke from under the bonnet. The recall inspection and fix are free, but this is another VIN-check item on a used car, and any Mk4 with unexplained oil smells deserves suspicion of this specific part before generic 'gasket' explanations are accepted.

Where to look: Right-hand engine oil separator, engine bay

Parts involved: PCV / oil separator.

Can't confirm for this car

Mk1 Focus hydraulic power steering systems leak from the high-pressure hose and pump seals with age. Left low on fluid the pump whines, then fails, and a groaning pump plus hose replacement adds up quickly on a low-value car. Fluid dripping onto the exhaust also creates a smoking/smell hazard that will spook any buyer behind you.

Where to look: PAS reservoir and pump on the engine, hoses running down to the steering rack

Parts involved: Steering rack.