Citroen C4 Picasso Diesel Particulate Filter DPF

The Diesel Particulate Filter (DPF) on the Citroën C4 Picasso, especially on models with the 1.6 HDi 109 hp engine, is a critical part of the exhaust system designed to trap soot particles from diesel combustion. It periodically burns off these particles through a process called regeneration, which can be passive or active at high temperature, turning them into less harmful gases. This helps the vehicle meet Euro 4 emission standards.

The DPF is located underneath the vehicle, integrated into the exhaust system after the catalytic converter. On some newer models, it may be combined with the catalytic converter. Additionally, the Cerine additive tank, which helps lower the combustion temperature of soot, is situated near the fuel tank under the vehicle.

If your DPF is defective or overloaded, you might notice the following symptoms :

• Increased fuel consumption
• Loss of engine power
• Illumination of the Check Engine light or pollution warning
• Frequent forced regeneration cycles
• Black smoke from the exhaust
• Error codes detected by OBD diagnostic tools

Monitoring these symptoms early can help prevent costly repairs.

To maintain your DPF and ensure proper regeneration :

• Take regular long journeys at steady speeds (60-80 km/h) to allow the filter to reach the necessary high temperature.
• Maintain engine speeds above 3000 rpm on highways to facilitate active regeneration.
• Use fuel additives recommended for cleaning diesel injection and particulate filters.
• Avoid frequent short trips that prevent the DPF from reaching optimal temperature.
• Consider professional cleaning with diagnostic tools like VCDS if necessary.

The DPF typically handles up to 60 grams of ash before risking irreversible blockage.

The expected lifespan of a DPF on a Citroën C4 Picasso is usually between 120,000 to 180,000 km, depending on driving conditions and maintenance. When replacement is necessary, it is recommended to have it done by a professional garage to ensure proper installation and resetting of the vehicle’s diagnostic system.

Replacing the DPF generally involves these steps :

• Lifting the vehicle safely.
• Disconnecting the exhaust system components.
• Removing the old DPF carefully.
• Installing the new DPF and securing it properly.
• Reconnecting all sensors and exhaust parts.
• Resetting the vehicle’s error codes using a diagnostic tool.

Ensure the new DPF meets the original equipment (OE) standards and complies with Euro 4 regulations.

The vehicle’s onboard diagnostics can detect when the DPF requires regeneration or if there is a blockage, but it does not typically display the exact ash content or percentage within the DPF. Regular diagnostics and monitoring are advised to avoid ash accumulation beyond the filter’s capacity.

If after attempting all recommended regeneration steps, your DPF error persists :

• Wait and continue driving at highway speeds for a longer time to complete regeneration.
• Check for any navigation or diagnostic interruption messages and follow the system prompts.
• Consider visiting a professional mechanic who can perform a thorough OBD diagnostic and manual cleaning or replacement if needed.

Ignoring the error may cause further engine or exhaust system damage. Address the issue promptly to avoid costly repairs.

Remember to always use quality parts compliant with your vehicle’s specifications for best performance and reliability.