Ford Focus Mk2 2.0 TDCi

The DW10 uses Delphi piezo common-rail injectors with a typical service life around 150,000-200,000 km. When they fail, symptoms include difficulty starting, rough running, misfires, increased smoke, and fuel leaking past the injector seals into the crankcase (detectable by a rising oil level that smells of diesel). A single reconditioned Delphi injector costs around €200-250 fitted at a specialist, while a new OEM injector with coding runs €400-500 per unit at a Ford dealer. On high-mileage cars, if multiple injectors fail at once, costs can reach €1,500-1,800 to replace all four. After fitting, each injector must be calibrated in the ECU using the code stamped on it. Fuel quality and clean filters are the best prevention.

Post-2006 models with a DPF use an Eolys cerium-based additive system to lower the soot regeneration temperature. The additive tank (1.8 litres) needs refilling approximately every 60,000 km or 3 years. If the tank runs dry, DPF regeneration cannot complete properly, leading to progressive clogging. Ford dealers charge around €100-120 for the refill and ECU reset. If the DPF is already blocked, a forced regeneration costs around €100-150. Chemical cleaning runs €200-400. Full DPF replacement costs €800-1,500 depending on OEM or aftermarket. Cars used primarily for short urban trips are highly susceptible, as the DPF needs sustained motorway driving at 2,500+ rpm to regenerate. Pre-2006 models without DPF avoid this issue entirely.

The dual mass flywheel on the 2.0 TDCi typically lasts 120,000-180,000 km but can fail earlier with frequent stop-start driving or clutch abuse. The telltale symptom is a metallic rattle at idle that disappears when the clutch pedal is pressed. The DMF should always be replaced together with the clutch kit and concentric slave cylinder, since labor for gearbox removal is the main expense. Parts cost approximately €400-500 for a complete DMF plus clutch kit. Independent shop labor runs €400-600 for the 5-6 hour job, while Ford dealers charge €800-900 in labor. Some owners fit a solid flywheel conversion (around €200-300 in parts) which eliminates future DMF failures but increases drivetrain vibration and noise. This is not specific to the Focus; it affects virtually all modern turbodiesels.

The DW10 turbo uses a variable-geometry mechanism controlled by a vacuum actuator. The pressure converter valve (boost control solenoid) and vacuum hoses deteriorate over time, causing leaks that prevent the turbo vanes from holding position. Symptoms include intermittent power loss, limp mode, surging boost, and the engine management light. Testing is straightforward: applying vacuum to the actuator with a hand pump should make it move and hold. If the pressure converter valve leaks, replacement costs around €80-150. However, if the turbo vane mechanism itself has seized from carbon buildup or the turbo bearings are worn from oil starvation, a remanufactured turbo unit costs €800-1,200 fitted at a specialist, or €1,200-1,500 at a Ford dealer. Unlike the 1.6 TDCi, the 2.0 TDCi does not suffer from the infamous oil feed gauze filter blockage that causes systematic turbo failure.

The EGR valve accumulates carbon deposits over time, particularly on cars used for short trips. When the valve sticks open or closed, symptoms include rough idle, poor throttle response, power loss, and the engine management light. On the DW10, the EGR cooler can also become blocked with soot, and simply replacing the EGR valve without cleaning the cooler often leads to the problem returning within 20,000-30,000 km. A new EGR valve costs around €200-300 for parts. Combined with EGR cooler inspection and cleaning, total repair at an independent shop runs €300-500. Ford dealers quote €500-700. Regular motorway driving and quality diesel fuel help prevent buildup.

The Focus Mk2 uses an electric power-assisted steering rack with an integrated electronic control unit. When this fails, the steering becomes extremely heavy, particularly at parking speeds, accompanied by a 'Power steering malfunction - service required' warning. The electronic control unit cannot be replaced separately from the rack. A reconditioned EPAS rack costs €400-600, while new OEM replacement with labour runs €1,200-1,600 at a Ford dealer. The entire front subframe must be dropped to access the rack, making it a labor-intensive repair. This is not a common failure but is expensive when it occurs and represents a safety concern since steering assistance is lost instantly.

At higher mileages (typically beyond 150,000-200,000 km), the DW10 engine can develop a characteristic tapping or ticking noise during the first few minutes after a cold start. This is caused by worn hydraulic lifters (hydrocompensators) that lose oil pressure when the engine is off. The noise usually subsides within 1-5 minutes once oil pressure builds. While this is primarily an annoyance and does not cause immediate mechanical damage, it worsens over time. Replacement requires removing the camshaft, with parts (16 lifters) costing around €150-250 and labour €200-500 depending on the workshop. Using high-quality fully synthetic oil and maintaining short oil change intervals helps extend lifter life.

Water leaking into the driver and passenger footwells is a well-documented Focus Mk2 issue regardless of engine variant. The most common cause is blocked drainage channels under the scuttle panel at the base of the windscreen. Leaves and debris accumulate, water overflows, and enters the cabin through bulkhead grommets. Another entry point is a disconnected drain tube under the scuff panel. Clearing the blockage and resealing costs €100-200. However, if water has been present for an extended period, it can damage the wiring loom under the carpet, corrode floor panels, and cause mould growth, escalating costs to €300-500. This issue affects all Focus Mk2 models equally and is preventable with regular scuttle drain cleaning.