Mitsubishi Lancer Evolution X

The AYC (Active Yaw Control) and ACD (Active Centre Differential) system relies on a hydraulic pump that is prone to internal corrosion. Over time, seals degrade and tolerances increase, causing the pump to lose pressure. Symptoms include the AYC/ACD warning light on the dashboard and reduced cornering ability. A new OEM pump costs approximately €2,500, plus €500 for fitting, system bleeding, and fluid replenishment. Refurbishment is possible at specialist workshops for around €700-800, though success rates are variable. Mitsubishi extended the warranty to 10 years/160,000 km in some markets (primarily US), but European coverage varied. The Evo X pump uses uprated motors compared to earlier Evos, but the motor itself is one of the common failure points on Evo X pumps specifically.

The Getrag 6DCT470 SST gearbox fitted to the MR variant is complex and requires more frequent maintenance than Mitsubishi originally recommended. The fluid should be changed every 30,000 km, not the longer intervals in the owner's manual. Common failures include the mechatronic unit (valve body solenoids sticking or failing), clutch pack wear causing judder, and shift fork issues. Mechatronic repair costs around €1,500-2,000 at a specialist, while a full gearbox rebuild runs €2,500-4,000. Complete replacement with a new unit can reach €8,000-10,000. Clutch pack replacement alone costs approximately €1,500-2,500. The 5-speed manual GSR variant avoids these issues entirely, though its clutch is still a wear item costing around €1,000-1,500 to replace.

The 4B11T's timing chain can stretch, particularly on 2008-2010 models and cars that have been driven hard or tracked. Symptoms include diagnostic codes P0017 (exhaust cam sensor) or P0012, rough idle, and the warning triangle on the dashboard. If the chain jumps teeth, it can cause catastrophic valve-to-piston contact. Mitsubishi has released an updated chain design. Replacement cost at a specialist is approximately €1,200-2,000 including the chain, oil pump chain, guides, tensioner, and oil/filter change. Pre-2011 cars are more susceptible; later models with the revised chain are less prone but not immune. Regular oil changes with quality synthetic oil every 7,500 km or 6 months help extend chain life.

The factory cast exhaust manifold is well known for developing cracks due to thermal cycling. The casting quality was poor, and cracks are extremely common, affecting most Evo X examples over time. Cracks typically form in the center of the collector. Symptoms include an exhaust leak sound behind the engine, exhaust smell under the bonnet, and in advanced cases, power loss and increased fuel consumption. Replacing with another OEM manifold is not recommended as it will likely crack again. A quality aftermarket tubular manifold costs €500-800, while OEM replacement runs approximately €400-600. Labour for fitting is typically 3-4 hours. Many owners consider this an eventual certainty rather than an if.

The original black fuel pump relay (pre-2012 models) degrades over time as the contacts arc during boost on/off cycling. The worn relay cannot maintain full voltage to the fuel pump, causing the pump to run at reduced speed and the engine to run dangerously lean under boost. The air-fuel ratio under load can rise from the safe 11.5-12:1 range to over 14:1, risking severe engine damage. This often goes unnoticed during normal driving. Mitsubishi released an upgraded blue relay (part number 8627A024) as the fix. The part costs under €30, and replacement takes minutes. Every Evo X owner should proactively swap to the blue relay regardless of symptoms. This is a cheap preventive fix that eliminates a potentially catastrophic failure.

The MAF sensor on the Evo X is a noted weak point. Symptoms include rough idle, hesitation under acceleration, inability to rev past 4,500 rpm, and the check engine light with code P0102 (MAF low reading). OEM sensors from Mitsubishi dealers cost approximately €300-500 in Europe. Importing from the US can reduce cost to around €150-200. Regular cleaning with dedicated MAF cleaner spray can extend sensor life significantly. Failure typically occurs between 80,000-150,000 km.

The Evo X's factory underseal protection is widely regarded as insufficient. In regions where road salt is used, underbody components including brake lines, fuel lines, and critically the subframes can corrode significantly. In severe cases, subframe deterioration can compromise structural integrity. The rear subframe and front chassis legs are the most vulnerable areas. Applying aftermarket underseal protection early in ownership is strongly recommended. Inspection should include lifting the car and checking all suspension mounting points and subframes for surface rust progression. Repair costs vary widely depending on severity, from minor surface treatment (€300-500) to subframe replacement (€1,500-3,000 including labour).