Ford's answer to the Golf GTI, offering 250 hp through the front wheels with a six-speed manual and characterful chassis. The 2.0 EcoBoost (R9DA, R9DB, R9DC and R9DD) uses a timing chain and is robust when kept stock with regular oil changes. The facelift from late 2014 brought improved steering feel and reduced torque steer. Main ownership concerns centre on the EPAS steering rack, rear wheel arch corrosion, and boot water ingress rather than serious powertrain issues.· more· less
EPAS module or rack fails, causing sudden loss of power steering assistance · more· less
The Mk3 Focus platform uses an electric power steering rack that is known for a higher-than-average failure rate. The steering motor or its control module can fail suddenly, resulting in complete loss of power assistance and a 'power steering assist fault' message. Water ingress on the rack-mounted module is a common root cause. Symptoms range from intermittent assistance loss on cold starts to total failure. Replacement requires dropping the front subframe, making labor expensive. An independent specialist can source a remanufactured rack for around €800-1,200 including fitting, while a Ford dealer may quote €1,500-2,000. The issue affects Mk3 Focus models broadly (2011-2018) and is not specific to the ST, but all Mk3 owners should be aware. ECU Testing and similar companies also offer rack motor repair services for around €350-500.
Rear wheel arch corrosion
up to €8002 of 7
Paint bubbling where the rear bumper contacts the wheel arch, eventually leading to rust · more· less
This is one of the most common cosmetic issues on the Mk3 Focus, including ST models. The rear bumper sits tightly against the wheel arch, causing paint to chip from road debris and vibration. Once the paint is compromised, rust develops quickly, especially in winter-driven cars. Ford generally does not honour the anti-perforation warranty for this issue, classifying it as bumper rub rather than structural corrosion. Professional repair and respray costs around €300-400 per arch. Preventive measures include applying clear protective film or regularly checking and touching up stone chips. The rears are more susceptible because rainwater is channelled toward them via the taillight area.
Boot water ingress
up to €3003 of 7
Water enters the boot through deteriorated tailgate seals, rear light clusters, or bumper vents · more· less
Water ingress through the tailgate area is so common on Mk3 Focus models that many owners consider it almost inevitable. Water typically enters through the plastic vents behind the rear bumper quarters, deteriorating rear light cluster seals, or failing tailgate weather strips. It collects in the spare wheel well and, during braking or acceleration, can flow forward under the rear bench into the footwells. The fix involves removing the rear lights and bumper to reseal with silicone, which is a straightforward DIY job costing around €50 in materials. A professional seal repair runs €150-300. Left unaddressed, standing water can cause electrical faults, mould, and unpleasant odours.
Turbo diverter valve failure
up to €3004 of 7
Stock bypass valve diaphragm collapses, causing boost leaks and flutter at lower RPMs · more· less
The factory diverter valve uses a rubber diaphragm that can collapse or leak over time, particularly if the car is driven gently (insufficient boost cycling) or exposed to high underbonnet temperatures. Symptoms include a high-pitched flutter at lower RPMs, loss of mid-range boost, and occasional EPC warnings. The OEM valve is a known weak point; many owners proactively replace it with an aftermarket piston-type unit (GFB DV+ or Turbosmart) for around €150-250, which provides a more durable design. The replacement takes approximately 30 minutes and is accessible without removing other components.
Intercooler charge pipe split
up to €4005 of 7
Rubber hose between turbo and intercooler develops splits, causing loss of boost · more· less
The rubber charge pipes connecting the turbo to the intercooler can develop small splits over time due to heat cycling and boost pressure. Symptoms include noticeable power loss, boost-related warning lights, and sometimes a whooshing or hissing sound under acceleration. The cold-side pipe is the most commonly affected. A replacement rubber pipe costs approximately €50-80, and uprated silicone hoses are available for €100-200 for a more durable solution. Labor is minimal as the pipes are reasonably accessible. Some owners also upgrade to T-bolt clamps to prevent factory clamps from loosening.
Broken front coil spring
up to €5006 of 7
Front coil springs fracture, causing clonking noise and uneven ride height · more· less
Some Mk3 Focus models, including the ST, experience front coil spring breakage. The lowered, stiffer ST suspension may be slightly more susceptible due to higher cornering loads. Symptoms include a clonking or pinging noise, especially on full steering lock, and visibly uneven ride height. Springs should be replaced in pairs and are followed by a wheel alignment. Parts cost €50-100 for a pair of OEM-spec springs, with labor around €150-300 depending on the shop. An alignment adds approximately €80-100.
Wiring loom chafing (pre-facelift 2012-2014)
up to €5007 of 7
Engine wiring harness chafes against the gearbox, causing rough idle and stalling · more· less
On early pre-facelift cars the engine loom can physically rub against the gearbox housing on right turns, wearing through insulation and causing shorts. Symptoms are hesitation, rough idle, and potential stalling. Ford's 14S17 splice recall covers Michigan-built vehicles rather than European cars, so on a European ST this is a wear inspection rather than an outstanding campaign. Inspect the loom routing near the gearbox for rubbed insulation and tape or clips fitted by a previous owner. An independent repair costs around €100-500 depending on the extent of wire damage.
Mechanically solid hot hatch with mostly minor issues
The Focus ST Mk3 is widely regarded as one of the more reliable performance cars of its era. The 2.0 EcoBoost engine is robust on stock tune with regular servicing, and the six-speed manual gearbox is durable. The main ownership concerns are the EPAS steering rack (shared with all Mk3 Focus models), cosmetic rear arch corrosion, and boot water ingress. Most issues are inexpensive to address. Serious engine failures are rare on unmodified cars. Pre-facelift models (2012-2014) need the engine wiring loom inspected for chafing where it passes the gearbox.
Service history
Complete Ford dealer or specialist records. Verify oil changes every 12 months or 20,000 km with the correct 5W-30 specification.
Tires
Check tread depth, age, and brand. The ST is sensitive to tire quality — budget tires noticeably affect handling.
Cold start
Start the engine cold. Listen for unusual noises, check idle stability, and watch for any warning lights.
Test drive
Minimum 30 minutes including varied speeds. Test hard acceleration and full steering lock in both directions.
Specific for this vehicle
Check power steering operation throughout test drive
Drive for at least 20 minutes. Feel for any heaviness, intermittent assistance loss, or warning messages. Turn the steering to full lock at low speed — EPAS failures sometimes reveal themselves here.
Inspect rear wheel arches for rust
Look at the edges where the rear bumper meets the wheel arch. Check both sides for paint bubbling, stone chips, or visible rust. Lift the boot carpet to check for signs of previous repair.
Check boot and spare wheel well for moisture
Lift all boot carpets and check for dampness, water stains, or mould. Pull back the spare wheel well cover and feel for standing water. Also check rear footwells under floor mats.
+ 3 more checksShow less
Inspect engine wiring loom routing (pre-2015 cars)
On 2012-2014 cars, look where the loom passes the gearbox housing for chafed or taped insulation. Start the car and watch for rough idle or stalling when the clutch is dipped.
Listen for boost leaks under acceleration
During hard acceleration, listen for hissing or whooshing sounds suggesting intercooler pipe splits or diverter valve leak. Any hesitation or sudden power drop mid-boost indicates a potential leak.
Check for modification history
Many STs are tuned. Check for aftermarket intake, exhaust, remap evidence, or aftermarket blow-off valve. Modified cars have higher failure rates, particularly pistons and head gaskets. A stock car is preferable for reliability.
Recalls and Technical Service Bulletins
Side and knee airbag non-deployment — vehicles produced July 2015 to December 2016Verify completed
Clutch pressure plate may fracture with fire risk, German campaign 18S39 for manual EcoBoost Focus ST Turnier (built 30 June 2012 - 29 May 2018)Critical - verify by VIN
Contact a Ford dealer with the VIN to verify all recalls have been completed. The airbag recall is the clearly applicable European action. The clutch pressure plate campaign 18S39 is documented for the German manual EcoBoost Focus ST Turnier population and the equivalent UK entry lists different engines, so it must be checked by VIN rather than assumed. Ford campaigns 14S17, 18S32, and 16S30 are North American actions and do not apply to European cars.
Warranty Status
Factory warranty (2 years)Expired on all Focus ST Mk3 models
Rust perforation warranty (12 years)May still apply to 2014+ cars — excludes rear arch bumper rub
Extended warranty availabilityAvailable through Ford dealers and third-party providers
All Focus ST Mk3 models are well outside their original 2-year factory warranty. The 12-year anti-perforation warranty may still cover later models, but Ford routinely declines rear wheel arch corrosion claims, classifying them as bumper contact damage rather than perforation.
Sources: Research draws on model-specific owner forums and owner communities, recall information from official authorities, German automotive press, and multiple workshop cost references cross-checked against each other.
This report is for informational purposes only and does not constitute professional advice. Estimates may be inaccurate. Always have a qualified specialist inspect the vehicle before purchase. We accept no liability for decisions made based on this information.
