Peugeot 308 Diesel Particulate Filter DPF

The Diesel Particulate Filter (DPF) in the Peugeot 308 is an advanced system designed to trap and eliminate 99.9% of the particulate matter emitted by diesel engines. It uses a porous silicon carbide structure with channels forcing exhaust gases through filter walls, capturing particles down to 0.1 micron in size. The DPF works in conjunction with the catalytic converter integrated in the exhaust line for effective pollution control.

The DPF is located at the exhaust outlet of the engine within the exhaust line. Exhaust gases first pass through the turbocharger before flowing through the DPF and the catalytic converter, which is integrated as part of the filter assembly.

The Peugeot 308's engine control unit manages automatic DPF regeneration by periodically burning off accumulated soot particles to restore filter efficiency and normalize differential pressure. This process is timed to occur every 350 to 800 km during long, fast driving conditions to remain transparent to the driver.

• Third post-injection combustion burns soot during engine expansion phase
• Exhaust gas recirculation is disabled and turbo is controlled to maintain engine torque
• Air flow may be redirected through a heating circuit to aid regeneration

A special additive is injected to facilitate particle combustion, closely monitored by the engine control unit.

The DPF system includes pressure sensors located upstream and downstream of the filter to monitor differential pressure and detect clogging. Temperature sensors also monitor exhaust gas temperature to ensure proper regeneration conditions and overall system operation.

Common symptoms of DPF clogging include:

• Illuminated engine or DPF warning light on the dashboard
• Reduced engine power due to restricted exhaust flow

If these symptoms occur, it is important to contact a qualified garage to diagnose and address the issue to prevent engine damage.

DPF maintenance may involve forced regeneration, cleaning, or replacement when automatic regeneration is no longer effective due to excessive soot accumulation. Typical forced regeneration steps include:

• Engine running at idle for 2 minutes to warm exhaust line
• Engine revving at 4000 rpm with post-injection to burn soot
• Return to idle after regeneration

After servicing, it is advised to drive the vehicle to remove any remaining additive residues from the filter and sensors to avoid damage.

DPF clogging is gradual and affects engine performance. The following load thresholds are critical:

• 40 to 50 grams: regeneration can be forced using diagnostic tools
• Above 50 grams: the DPF is considered clogged, and automatic regeneration is ineffective, requiring cleaning or replacement

Regular monitoring and timely service can prevent reaching critical clogging levels.

For any questions regarding Peugeot 308 DPF parts, installation, or technical support, please contact Krosfou's professional service team. They provide expertise on functionalities, repair rules, safety, and compliance with all new regulations. Krosfou offers original high-quality DPFs manufactured in Europe, fully compliant with manufacturer specifications and covered by a 3-year warranty.

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Note: Always entrust Peugeot 308 DPF interventions to qualified professionals with the proper diagnostic equipment to ensure safety and system integrity.