Peugeot 508 Diesel Particulate Filter DPF

The DPF on a Peugeot 508 diesel captures fine particles such as soot, hydrocarbons, and sulfates from exhaust gases to reduce pollution. It complies with Euro 5 and higher emission standards. Positioned between the catalytic converter and the rear silencer, the DPF operates at high temperatures (550-600°C) to burn off trapped particles, ensuring cleaner emissions and environmental protection.

There are two main types of DPF regeneration:

• Passive regeneration : Occurs naturally when driving at high engine revs on roads or highways, burning the soot accumulated in the filter.
• Active regeneration : Triggered by the engine control unit injecting extra fuel to raise exhaust gas temperature to 450-600°C for soot combustion. Peugeot uses a special additive to reduce this temperature to around 450°C.

This process helps maintain efficient DPF function and prevents blockage.

A blocked or failing DPF can cause various issues including :

• Loss of power during acceleration
• Illumination of the DPF or engine warning light on the dashboard
• Increased fuel consumption as the engine compensates for the blockage
• Black or blue smoke from the exhaust
• Potential long-term engine damage due to unfiltered particles

Common causes include frequent short trips or low-speed driving which prevents proper regeneration.

Typical maintenance intervals for the Peugeot 508 DPF are :

• First DPF service or check between 120,000 and 180,000 km depending on the model
• Subsequent replacements or cleanings every 30,000 to 150,000 km

Diagnosis is usually done via pressure and temperature sensors linked to the ECU. Professional cleaning or replacement is recommended when faults or persistent blockages occur.

Replacing the DPF requires removing the exhaust line and fitting a new approved DPF. Use of E-mark homologated parts is important to maintain regulatory compliance and vehicle tax classification.

• Professional installation is recommended due to the complexity
• Step-by-step guides and technical manuals like RTA offer detailed maintenance procedures
• Sensor checks and ECU resets may be needed after replacement

Correct replacement ensures efficiency and avoids issues with emissions and engine performance.

Yes, cleaning is an option before replacement, especially if the DPF is clogged but not damaged.

• Professional cleaning can involve chemical or thermal processes to remove soot and ash
• Guides and tutorials provide instructions for DPF cleaning and regeneration procedures
• Sensors and regeneration cycles should be checked and reset after cleaning

Regular maintenance and avoiding short trips help keep the DPF cleaner for longer.

The DPF is monitored via sensors measuring pressure differential and temperature. These send data to the engine ECU for regeneration control.

• Diagnostic tools such as PP2000 or Diagbox can provide live sensor data and error codes
• Monitoring sensor readings helps detect faults or blockage early
• Discussions in Peugeot forums often share common issues and fixes

Regular checks ensure timely maintenance and avoid bigger issues.

To maintain a healthy DPF on your Peugeot 508 :

• Avoid frequent short trips or prolonged low-speed driving that prevents regeneration
• Drive at higher revs regularly (e.g. motorway driving) to enable passive regeneration
• Use recommended engine oil and additives suitable for DPF-equipped diesel engines
• Regularly check and maintain the exhaust and fuel systems

Following these practices helps prevent DPF faults and maintains engine and exhaust system performance.