Ford Focus RS Mk3

All cars built between August 2015 and July 2017 were affected by recall FSA17832. The original head gasket had a coolant passage hole intended for the Mustang version of the 2.3 EcoBoost, which allowed coolant to stagnate between cylinder bores and damage the cylinder head. Symptoms include white exhaust smoke, coolant loss without visible external leaks, misfiring on cold start, and loss of cabin heating. Ford's fix replaces the cylinder head and gasket with revised parts. The recall officially ended in 2019, meaning any unresolved cars are now the owner's responsibility. The revised gasket can be identified by a brass rivet with a hole on the front right of the engine block. If buying, this is the single most important check. Repair cost if not covered by recall: €1,500-2,500 for gasket replacement, up to €4,000 if the cylinder head is warped and needs replacement.

The GKN-developed rear drive unit uses twin clutch packs instead of a traditional differential. During aggressive driving, track use, or repeated drift mode engagement, the RDU generates significant heat. When temperature limits are reached, the ECU reduces power to protect the unit. Over time, the clutch packs wear, particularly on cars that have seen track use or frequent drift mode activation. Warning signs include AWD malfunction warnings, whining from the rear, and vibrations on tight turns. Ford's service manual specifies limited drift mode use before requiring RDU servicing. A complete RDU replacement costs approximately €3,000-5,000 including calibration. RDU fluid changes every 30,000-50,000 km are essential preventive maintenance and cost approximately €150-200 per service.

The power transfer unit that distributes torque between front and rear axles is known for developing fluid leaks from multiple seal points. Ford released a TSB (18-2255) acknowledging right-side PTU fluid leaks with repair kits available. The intermediate shaft seal can often be replaced without removing the entire PTU (approximately €500), but if the output shaft seals require attention, the PTU must be removed, which involves approximately 5 hours of labor and costs €800-1,500 total. Metal flakes in PTU fluid during early changes are common and generally considered normal break-in, but excessive contamination indicates internal wear. Regular PTU fluid changes every 30,000 km are critical to prevent premature wear.

The Focus RS uses a 6-speed manual gearbox with a dual-mass flywheel. With 350 hp and 440 Nm of torque, clutch wear can be accelerated by aggressive launches and track use. Some owners have reported clutch replacement needed as early as 35,000-50,000 km with hard use, though careful drivers can see 80,000-100,000 km. Ford genuine clutch and flywheel kit costs approximately €600-700 for parts. Labor runs approximately 5-6 hours (€500-700), bringing total replacement to €1,200-1,500 at an independent specialist and up to €2,500 at a Ford dealer. Signs of wear include clutch slip under full boost in higher gears, a juddering feeling during engagement, or difficulty selecting gears.

Like all direct injection engines, the 2.3 EcoBoost does not wash fuel over the intake valves, allowing carbon deposits to build up gradually. This becomes noticeable typically after 60,000-100,000 km as reduced throttle response, slight power loss, and rough idle. Walnut shell blasting is the standard cleaning method, costing €350-600 depending on the shop. This is not a defect but an inherent characteristic of direct injection engines. Some owners use oil catch cans as a preventive measure. Recommended to perform walnut blasting every 60,000-80,000 km as maintenance.

The stock BorgWarner twin-scroll turbocharger is generally robust on unmodified cars with proper oil change intervals. Failures are significantly more common on tuned vehicles where increased boost pressure and exhaust gas temperatures exceed the turbo's design limits. On stock cars, the main risk comes from oil starvation due to extended oil change intervals or oil degradation from frequent short trips. Symptoms include excessive exhaust smoke, power loss, unusual whining, or oil in the intercooler piping. Turbo replacement at a specialist costs approximately €1,500-2,000. A Ford dealer may charge up to €3,000. Keeping oil change intervals at 10,000 km or annually (whichever comes first) with quality fully synthetic oil significantly reduces this risk.

The Focus RS uses electronically adjustable dampers that were revised multiple times during production. Ford issued updated part numbers in April 2017 and again in November 2017, suggesting issues with earlier units. Symptoms include uneven ride quality, knocking over bumps, or visible oil leaking from the damper body. Each damper costs approximately €300-400 to replace. Cars built after late 2017 with the latest revision are less prone to this issue. When replacing, always use the latest revision part number to benefit from Ford's improvements.

Separate from the coolant-related head gasket recall, many Focus RS engines develop an oil leak where the head gasket meets the front timing cover. This occurs because the original Ford procedure did not specify sealant application at this junction. Ford revised the procedure in July 2018 to include sealant. Cars that had the head gasket recall completed before this date may still develop this oil leak. The fix requires removing the timing cover and resealing with the updated procedure. This is typically a warranty repair if diagnosed early, but out-of-warranty costs run €500-1,500 depending on the shop. The leak is usually a slow seep rather than a catastrophic failure.