Citroen DS4 Diesel Particulate Filter DPF (2011-2015)

The Diesel Particulate Filter (DPF) is a component positioned in the exhaust line, generally after the catalytic converter. Its function is to trap soot particles produced by diesel combustion, which are harmful to health. These particles include carbon cores bonded with hydrocarbons, sulphates, sulphur, and various metallic oxides. Citroën DS4 diesel engines use a ceramic DPF, designed to capture and reduce particulate emissions effectively.

The DPF regeneration process can be passive (natural) or active (forced):

• Passive Regeneration: Occurs naturally during normal engine operation when exhaust gases reach around 550 to 600°C, burning off soot particles.
• Active Regeneration: Triggers fuel injection into the exhaust to raise the temperature of the filter when passive conditions aren't met.
• PSA Additive: Citroën uses an additive injected with fuel that lowers combustion temperature to about 450°C, allowing more efficient regeneration.

This system ensures the DPF remains operational by burning soot deposits regularly.

To manually initiate a forced regeneration and burn accumulated soot, the vehicle must maintain exhaust temperatures approximately between 400 and 450°C for 10 to 15 minutes. This can be achieved by:

• Driving the vehicle at full engine load, maintaining engine speed between 3,000 and 3,500 rpm.
• Keeping throttle opening between 75% to 100%.
• Ensuring the vehicle is heavily loaded with all electrical consumers active (headlights, fog lights, climate control at max).

This procedure is generally done on-road and can help clear the filter if it is significantly clogged.

The DPF gradually clogs as soot and ash particles accumulate inside the filter. While soot is burnt during regeneration, the remaining ash builds up and reduces filter efficiency. Signs of clogging include:

• Illumination of the "Service" warning light on the dashboard.
• System alerts warning of filter blockage risk.

At advanced stages, professional cleaning or replacement is recommended to restore DPF function.

The average price for a new DPF including parts and labour ranges from £500 to £730 approximately, depending on the engine version. The replacement typically takes around 45 minutes to 1 hour. Some variations by engine version include:

• 1.6 BlueHDi 115hp: around 48 minutes
• 2.0 BlueHDi 150-180hp: approximately 42 minutes
• 1.6 THP petrol engines may not have a DPF at all

Installation is generally considered straightforward for professional technicians.

Not all models of Citroën DS4 have a DPF. Typically:

• Diesel engines like 1.6 HDi and 2.0 BlueHDi versions come equipped with a DPF.
• Some petrol engines with direct injection (THP range) and VTi petrol engines may not have a DPF installed.

Always verify your specific vehicle version for DPF presence before maintenance or replacement.

The PSA additive, used to lower soot combustion temperature to around 450°C, is designed to last for approximately 120,000 km. It is regularly injected into the fuel system with precision and topped up during scheduled maintenance by professionals. This additive helps to maintain efficient regeneration cycles transparent to the driver.

High-quality new DPFs for Citroën DS4 are available direct from reputable manufacturers offering authentic parts with a 3-year warranty and free or express delivery options in the UK. These DPFs are made from durable INOX 409 stainless steel and meet or exceed OEM standards, ensuring long-lasting performance and regulatory compliance.

• Orders made before 11 am can often be shipped the same day.
• Standard delivery usually takes between 3 to 8 working days free of charge.
• Express delivery is available within 24 to 48 hours for faster need.

Check product pages for the exact delivery info and warranty details before purchase to ensure peace of mind and a smooth servicing experience.