Subaru Outback 2.0D BS

The EE20 diesel's DPF system is particularly sensitive to driving patterns. Short urban trips prevent the exhaust from reaching the temperatures needed for passive regeneration, causing rapid soot accumulation. When soot load gets too high, the ECU attempts active regeneration by injecting extra fuel post-combustion, but if the drive is interrupted before completion, the cycle restarts. The DPF warning light starts flashing when oil dilution reaches approximately 10%. A professional DPF clean costs approximately €300-500 at a specialist. If the filter is beyond cleaning, a replacement DPF costs €800-1,500 for an aftermarket unit or €1,500-2,500 including fitting at a Subaru dealer. Subaru themselves acknowledge this model is not suited to predominantly urban or suburban driving. A monthly motorway run of at least 30 minutes at sustained speed is considered the minimum to keep the DPF healthy.

During active DPF regeneration, extra diesel is injected post-combustion to raise exhaust temperatures. Some of this fuel washes past the piston rings into the sump, diluting the engine oil. The vehicle monitors oil dilution and triggers a warning when it exceeds approximately 10%. Owners report the dipstick oil smelling like kerosene and the oil level rising above maximum. If left unchecked, diluted oil loses its lubricating properties, leading to accelerated bearing wear, cylinder scoring, and in severe cases engine failure requiring a rebuild or replacement at €3,000-3,500. Prevention: change oil more frequently than the standard interval if driving includes significant urban use (every 7,500 km or 6 months instead of the standard 15,000 km), and ensure regular highway driving to complete regeneration cycles.

The EE20 has both a high-pressure and low-pressure EGR system (the low-pressure system was added from late 2014 for Euro 5/6 compliance). Carbon buildup gradually restricts the EGR valve and cooler, particularly on cars doing mostly urban driving. The low-pressure EGR includes a fine gauze filter between the DPF and EGR valve that becomes blocked with soot, triggering fault code P049B and derate mode. Symptoms include rough idle, loss of power, and increased smoke. Cleaning the EGR system at a specialist costs approximately €300-500. If the valve itself needs replacement, parts cost €200-400 plus labor. The EGR cooler can fail separately, adding €400-700. Preventive cleaning every 60,000-80,000 km is recommended.

The EE20 turbocharger can develop bearing wear over time, particularly if oil change intervals were stretched or low-quality oil was used. Symptoms include increased oil consumption through the turbo seals, blue smoke on acceleration, and whining noises. The intercooler boost pipes are made of thin rubber that is known to crack and split, causing boost leaks that result in power loss and fault codes. Replacing cracked boost pipes is relatively affordable at €100-300 with aftermarket silicone upgrades available. A full turbo replacement including labor costs approximately €1,500-2,500 at a Subaru dealer. The flat-four layout makes turbo access more difficult than on inline engines, increasing labor time.

The EE20 uses ceramic-tipped glow plugs that can fail and short to ground. When a glow plug shorts, it blows fuse F14, which is shared with the ABS system. This simultaneously disables ABS, VDC (stability control), and traction control, with all corresponding warning lights illuminating. The glow plugs can become seized in the head over time, making extraction difficult. If a plug breaks during removal, specialist extraction is needed which adds cost. Replacing all four glow plugs when accessible costs approximately €150-300 at a specialist. If plugs are seized and require special extraction, costs can reach €500-800. Using anti-seize compound during installation helps prevent future seizure.

Manual gearbox Outback 2.0D models use a dual-mass flywheel to dampen the diesel engine's inherent vibration. The DMF wears over time, producing a noticeable vibration through the clutch pedal and rattling at idle. Replacement typically becomes necessary between 100,000 and 150,000 km depending on driving style. A DMF and clutch kit replacement costs approximately €1,200-2,000 at an independent specialist, with the DMF itself costing €400-600 and the clutch kit adding €200-400. Some owners opt for a solid flywheel conversion at similar cost, though this increases engine vibration felt in the cabin. This issue only applies to manual gearbox cars; CVT models are not affected.

CVT-equipped diesel Outbacks share the same Lineartronic transmission as the petrol version. The valve body solenoids can fail, typically after 120,000-180,000 km, triggering fault codes P2764 or P0700. Symptoms include harsh shifting, shuddering during light acceleration, or limp mode. A valve body replacement costs approximately €1,200-1,800 at a Subaru dealer. If the torque converter or chain is also damaged, full CVT replacement can reach €4,000-5,500. Regular CVT fluid changes every 50,000 km significantly reduce the risk. Subaru extended the CVT warranty to 10 years or 160,000 km on certain models. The diesel engine's higher torque output adds slightly more stress to the CVT compared to the petrol variant.

The alternator belt tensioner on the EE20 diesel has a hydraulic damping mechanism that can develop oil leaks. Oil seeps onto the serpentine belt, causing slipping, squealing, and eventual belt failure. Some owners report repeated tensioner failures occurring as frequently as every 5,000-10,000 km on affected cars. Replacement of the tensioner and belt costs approximately €200-400 at an independent shop. If the belt breaks while driving, it can damage other components, potentially reaching €500 in total repairs. The flat-four engine layout means oil from the tensioner tends to collect at the front of the engine.