Citroen C3 Diesel Particulate Filter DPF

The DPF on Citroën C3 diesel models (such as 1.4 HDi or 1.5 HDi) is a porous ceramic component made of silicon carbide or cordierite, positioned in the exhaust line after the catalytic converter. It traps up to 99.9% of pollutant particles like soot, hydrocarbons, and sulfates released from engine exhaust gases.

The DPF operates by forcing exhaust gases through a porous filter structure (with a filtration threshold of 0.1 micron), where particles accumulate in the filter walls. There are two main types of regeneration:

• Passive regeneration: At high exhaust temperatures (550-600 °C), usually during highway driving, soot burns off naturally to ash stored in the filter.
• Active regeneration: Under lower temperature conditions (city driving or idling), the engine ECU injects fuel into the exhaust or uses an additive (cerine) to increase the filter temperature and burn accumulated soot.

The PSA system includes an additive reservoir and sensors to monitor filter pressure differential and control regeneration cycles automatically via the ECU.

DPF issues may present as follows:

• Dashboard error messages like "Low additive level" or "DPF blockage risk"
• Progressive filter clogging leading to increased back pressure detected by sensors
• Vehicle entering limp mode, resulting in power loss and engine speed limitations

If these symptoms appear, it is important to have the DPF and related sensors checked promptly at a garage or diagnostic centre.

Proper maintenance includes:

• Using a cleaning spray injected through the pressure differential sensor pipe on top of the filter, followed by driving to verify reduced pressure readings below 7 mbar
• Performing forced regeneration with diagnostic tools when soot accumulation is high
• Refilling or replacing the additive pouch (cerine) as needed
• Regularly driving at higher engine speeds on open roads to promote passive regeneration
• Avoiding frequent short urban trips that prevent the engine from reaching optimal temperature for regeneration

Consult your garage for professional cleaning, additive service, or if replacement is necessary.

According to technical reviews, replacing the DPF is a straightforward operation. It involves draining the additive fluid, changing the cerine pouch, and installing a new filter. It is recommended to have this work done at an independent garage or a specialized service centre to ensure correct installation and ECU reset if necessary.

The engine control unit (ECU) continuously monitors the DPF via pressure sensors placed before and after the filter. It anticipates regeneration needs, controls additive dosing, and may limit engine RPM (e.g., 2200 rpm in degraded mode) if clogging is detected. This active management ensures emission control compliance, maintains engine performance, and prolongs DPF lifespan.

• Pressure differential ideal range during acceleration: 5-7 mbar
• Automatic diagnostics and self-regeneration commands

Regular diagnostic checks at a garage help verify ECU and sensor function related to the DPF.

DPFs for Citroën C3 diesels are typically made from silicon carbide ceramic, renowned for high durability and thermal resistance. The filters conform to manufacturer specifications and European emission standards (Euro 4 to Euro 6). They are designed and produced using advanced technologies including stainless steel housings and high-quality monolith coatings to ensure superior particle filtration efficiency and service life.

• Filtering effectiveness: up to 99.9% particle removal
• Temperature regeneration range: 550-600 °C (passive), lower temperatures achieved with additive
• Manufactured according to strict emission and quality regulations to support vehicle compliance

For best results, use genuine or certified quality filters and parts for replacement.

Reliable DPF replacements comply with TÜV SÜD certified standards and European regulations. High-performance new DPFs manufactured in stainless steel with advanced ceramic monoliths ensure long-term durability and optimize vehicle emission control and performance.

• Certified quality parts ensure full compatibility and emission compliance
• Technical support and installation guides are available from specialist suppliers
• Professional garages and independent service centres offer installation and diagnostic services
• Maintaining genuine sensor connections is essential for proper DPF function and ECU control

Always ensure correct part reference by providing vehicle details and VIN when ordering or consulting a garage.

If you experience DPF warning lights or reduced performance, contact a qualified service centre for diagnostic and repair to avoid further engine issues.