Audi A4 Diesel Particulate Filter DPF

The Diesel Particulate Filter (DPF) is an anti-pollution device fitted on Audi A4 diesel engines, positioned after the catalytic converter and before the exhaust silencer. It traps up to 99% of fine particles (soot and ash) generated by diesel combustion, which are harmful and potentially carcinogenic. The DPF consists of a ceramic body containing approximately 50 microscopic channels per cm². These channels capture soot particles as exhaust gases pass through, forming a layer that improves filtration but also increases back pressure, potentially clogging the engine and reducing power.

DPF regeneration is the process of burning off accumulated soot to clean the filter. There are three types of regeneration :

• Passive regeneration : occurs naturally at high engine load when combustion temperature exceeds 600°C, burning soot without intervention.
• Active regeneration : triggered by the engine control unit when a pressure sensor detects saturation. It uses EGR valve activation, post-injection, and turbo adjustment to raise exhaust temperature for 5–15 minutes, converting soot into CO₂, water vapor, and ash every 500–700 km depending on driving style.
• Manual regeneration : initiated via diagnostic tools, especially useful for frequent short or urban trips where passive/active regeneration is insufficient.

Some DPFs use additives like cérine to lower the soot combustion temperature by about 100°C, facilitating regeneration at lower load conditions.

The initial sign of DPF clogging is the illumination of the "Service" warning light on the dashboard, often accompanied by a message warning of possible filter saturation. Excessive back pressure can be detected by the differential pressure sensor, indicating the need for regeneration or service.

Over time, non-combustible ash accumulates permanently in the DPF, which cannot be removed by regeneration and requires periodic replacement to maintain engine performance. The replacement procedure varies by Audi A4 model and engine code; always consult detailed technical guides for your specific vehicle.

• Example: New DPF available for Audi A4 2.0 TDI 150 hp (CSUA engine, 11/2012-12/2015, Euro 6 standard) with delivery in 4 days.
• Compatible DPF units are also available for older models like Audi A4 2.0 TDI B6/B7 (140 hp / 103 kW, 2006-2009).

Always select the correct DPF part based on your vehicle identification number (VIN) and engine specifications for optimal performance and compliance.

Installing a new DPF can effectively restore your vehicle's emission control performance and alleviate power loss caused by filter clogging. However, ensure that the source of the problem is correctly diagnosed before replacement. Proper fitting and selection of recommended accessories are essential for maintaining engine and transmission efficiency.

Use your vehicle details, including year, engine type, and VIN, to select the appropriate DPF for your Audi A4. Accessories such as pressure sensors and assembly kits should also be matched carefully. Our guided selection ensures quick entry and collection, with dealer support to help you add the correct product to your cart for expedient processing.

• Always verify compatibility with your transmission and engine specifications.
• Consult technical content and recommended service intervals for best results.

Adding products to your garage online can simplify future orders and returns.

DPF lifespan depends heavily on driving conditions, vehicle maintenance, and regeneration frequency. While 100,000 km is a general usage limit under warranty terms, frequent short trips, city driving, or poor regeneration cycles can reduce filter life. Being aware of symptoms and following recommended service can extend the DPF's operational time.

• Regular monitoring of filter pressure and warning systems is advised.
• Using additives or enhanced ceramic technology filters can improve durability.

Always consult your dealer or specialist when you notice service warnings or performance drops.

Additional detailed explanations about DPF functioning, regeneration types, and the role of cérine additives can be found on authoritative automotive websites and technical guides. Dedicated forums and owner clubs provide valuable user experiences, videos, and troubleshooting tips. Professional dealers offer installation manuals, quick delivery, and warranty-backed products with expert technical support available via email or online channels.

• Refer to certified sources for accurate diagnostics and part selection.
• Use trusted dealer platforms for quick access to parts, accessories, and a reliable service collection and return policy.

Choosing high-quality, new DPFs certified to European standards ensures compliance and environmental protection for your Audi A4 diesel vehicle.