Peugeot 2008 Diesel Particulate Filter DPF

The Diesel Particulate Filter (DPF) on the Peugeot 2008 diesel models, often equipped with HDi engines like the 1.6 BlueHDi, is a ceramic component within the exhaust system. It traps toxic soot particles from the exhaust gases to help meet Euro 5 and Euro 6 emission regulations by filtering particles down to 0.1 microns. The DPF regenerates automatically by burning off accumulated soot at high temperatures, controlled by the engine's computer using sensors.

Exhaust gases pass through the porous walls of the DPF, which traps soot particles that would otherwise clog the filter. When the soot load reaches a certain level (based on differential pressure between filter inlet and outlet), the engine ECU initiates regeneration by increasing exhaust temperature to around 600°C. This is achieved by injecting extra fuel and managing turbo and EGR systems to maintain engine performance while burning soot off. There are two primary types of regeneration: direct high-temperature burn near the engine (DPF) and additive-aided regeneration (FAP) further downstream.

Yes, manual regeneration can be initiated by driving the vehicle for about 25 to 30 minutes at speeds between 60-80 km/h with engine revolutions ranging from 2000 to 3000 RPM. This helps raise exhaust temperature sufficiently to burn the soot in the filter. This method is especially recommended if your vehicle mainly does short trips that prevent automatic regeneration. Alternatively, professional diagnostics tools can trigger regeneration if required.

If DPF regeneration is prevented due to low fuel level, faulty sensors, blocked EGR, low exhaust temperatures, or frequent short trips, soot accumulates causing clogging. Symptoms include:

• Loss of engine power and performance
• Warning lights or messages on the dashboard
• Possible limp mode activation
• Diagnostic fault codes related to DPF or particulate sensor issues

If you experience these issues, a diagnostic check with the engine at operating temperature (~80°C) can measure differential pressure to assess clogging level.

During diagnostic checks with the engine warm, expected differential pressure readings (in mbar) are:

• Ignition off: 0-5 mbar (higher values suggest wiring or sensor issues)
• Idling (~800 RPM): 0-10 mbar (>10 suggests potential clogging)
• Acceleration (2500-3000 RPM): 20-60 mbar for engines under 2L; 70-90 mbar for over 2L
• At high RPM (~3000 RPM): 160-300 mbar indicates regeneration possible; above 300 mbar suggests need for cleaning or replacement

Abnormal readings indicate sensor or piping faults or excessive DPF clogging.

Several solutions exist depending on severity:

• Cleaning: Professional DPF rinsing restores filter performance by removing soot and ash without ECU modifications. Regular motorway driving helps prevent clogging.
• Repair: Chemical cleaning and high-pressure rinsing may be used for moderately clogged DPFs.
• Replacement: Needed if the DPF is fully saturated or damaged. New DPF products conform to manufacturer specifications and strict quality standards.

Always follow proper diagnostic and maintenance practices to extend the DPF life.

With proper driving conditions and regular maintenance, the DPF can last between 150,000 and 180,000 km. Avoiding excessive short trips and ensuring the vehicle reaches operating temperature regularly to enable regeneration are key for longevity.

It is not recommended to drive with the DPF removed as it can cause increased emissions and may trigger warning lights and engine management issues. Legal regulations in many regions require fitted DPF systems to meet emission standards. Removing the filter can also void warranties and lead to fines. Always ensure your vehicle operates with a correctly functioning DPF system.

If you see a DPF warning or light on your dashboard, check the filter level and arrange appropriate cleaning or repair rather than removal.