Subaru Trezia Diesel Particulate Filter DPF (2010-2016)

The Diesel Particulate Filter (DPF) on the Subaru Trezia 1.4D diesel engine is an essential anti-pollution component installed in the exhaust system. Positioned after the catalytic converter and before the silencer, it captures up to 99% of fine soot particles from combustion to reduce harmful emissions.

The DPF contains a ceramic body with about 50 microscopic parallel channels per cm². Exhaust gases pass through these channels while solid particles such as soot are trapped inside. Over time, these trapped particles form a layer that improves filtration but can increase backpressure if not cleaned.

The Subaru Trezia employs three main regeneration types to clean the DPF:

• Passive regeneration: Occurs during continuous driving at highway speeds, burning off soot at 350-500°C.
• Active regeneration: Triggered by the engine control unit when soot exceeds about 18g; it raises DPF temperature to around 620°C using fuel post-injection and other engine adjustments to burn off soot.
• Kilometric regeneration: A safety cycle that activates every 750-1000 km if no recent regeneration has occurred.

An optional additive can lower soot combustion temperature to aid regeneration at low engine loads.

Symptoms of a clogged or malfunctioning DPF include:

• DPF warning light illuminated on the dashboard
• Loss of engine power
• Increased fuel consumption
• High exhaust backpressure causing engine strain and increased pollution

Urban driving with short trips less than 15 minutes can prevent proper passive regeneration, accelerating soot accumulation and risk of DPF failure.

To maintain a healthy DPF, consider the following:

• Regularly drive on the highway for 20-30 minutes to ensure passive regeneration.
• Perform forced regeneration using diagnostic tools at a garage when needed.
• Use preventive carbon cleaning with hydrogen-based treatments approximately every 15,000 km to remove soot and hydrocarbons.

Ignoring maintenance can lead to irreversible damage and costly replacements.

If you suspect your DPF is blocked, the best actions are:

• Visit a professional garage for a forced DPF regeneration via an OBD diagnostic tool.
• Consider carbon cleaning treatments to remove soot deposits without dismantling.
• Replace the DPF only if cleaning and regeneration fail, noting that replacement costs can exceed £2000.

Early intervention helps prevent engine damage and ensures compliance with emission standards.

DPF products for the Subaru Trezia diesel model are made with high-quality cordierite ceramic monoliths housed in stainless steel shells. They match vehicle specifications with references ensuring perfect fitment and filtration efficiency in compliance with EU standards.

• The weight and code of the DPF correspond to the exact model requirements.
• These products do not include reconditioned parts but are brand new and certified for durability and performance.
• Compatibility should always be verified using vehicle codes and references before selecting a DPF.

Proper selection guarantees optimal pollution reduction and engine performance.

Maintaining the DPF is crucial to:

• Preserve engine power and fuel efficiency
• Prevent expensive repairs and DPF replacement costs
• Reduce harmful particulate emissions and stay compliant with environmental regulations
• Avoid irreversible engine damage caused by excessive exhaust backpressure

Good DPF upkeep ensures your Subaru Trezia remains reliable, environmentally friendly, and compliant with EU diesel emission standards.

Remember to regularly check for warning lights and signal codes related to the DPF system and seek professional assistance when needed.