Peugeot 406 Diesel Particulate Filter DPF (1995-2004)

The DPF on Peugeot 406 diesel models equipped with 2.0 HDi (8V, RHS/RHZ - DW10ATED) and 2.2 HDi (8V, 4HX - DW12TED4/FAP) engines is designed to meet Euro 4 emission standards. Located under the seat along the exhaust line, it measures about 465 mm in length and weighs around 5 kg. It is coupled with an Eolys additive system for passive and active soot regeneration to reduce particulate emissions.

Typical signs of DPF malfunction or clogging include:

• Loss of engine power, especially on acceleration, caused by gradual filter blockage.
• Conditions worsening the clog include frequent short trips, low engine speeds, and lack of filter regeneration.
• Warning lights on the dashboard or alarm if the Eolys additive tank is empty, risking accelerated blockage.

Regular highway driving is recommended to allow the DPF to regenerate by reaching temperatures around 600°C needed to burn off particulates.

The DPF is located under the vehicle like a rear silencer. Replacement involves the following key steps:

• Disconnect pressure hoses, sensors, and the pressure sensor (OE references available).
• Optionally refill the Eolys additive tank, located near the left rear wheel suspension.
• Unscrew the 4-bolt flange or collar; generally includes mounting kit KIT362.
• Replace the pressure sensor concurrently, as hoses solidify under regeneration heat.
• Reset the vehicle's control unit, usually available at Peugeot dealers for about £45, though not mandatory if sensors operate correctly.

Detailed illustrated guides and step-by-step videos are available on dedicated Peugeot 406 technical forums and websites.

Eolys additive helps lower the combustion temperature of soot within the DPF, facilitating efficient regeneration. It is toxic, so safety equipment such as gloves and masks are recommended when handling.

• Refill intervals correspond to vehicle mileage, e.g. 80,000 miles (white cap) and 120,000 miles (green cap) products are recommended.
• The additive is delivered with a container and hose; dashboard alarms warn if additive distribution fails, which can cause rapid DPF clogging.

Maintaining adequate additive levels is crucial to ensure the DPF operates safely and effectively.

New, high-quality DPFs manufactured in the EU with a 3-year warranty are available for 2.0 HDi and 2.2 HDi engines. These include kits with mounting accessories and recommended sensors for proper operation.

• Examples of part numbers cover various Peugeot 406 diesel variants, emphasizing original part reference compatibility.
• Professional installation is advised; resetting control units and sensor replacement are part of the procedure.

For best results, always acquire parts compliant with European regulations and verified for compatibility with your engine code and vehicle age. Ensure parts are new and never reconditioned.

Preventative tips include:

• Regular highway drives to achieve the temperature needed for DPF regeneration.
• Monitoring the additive level and refilling the Eolys tank as required to avoid warning messages.
• Using high-quality fuel and ensuring engine health to minimize soot production.
• Following maintenance schedules and checking for fault codes promptly.
• Ordering genuine parts with proper references and avoiding off-brand or uncertified products.

Proper running conditions and timely servicing can significantly extend DPF life and maintain engine power output and exhaust cleanliness.

Removing the DPF is not recommended as it compromises compliance with emission standards and may cause legal issues. It also negatively impacts exhaust cleanliness and can cause engine warning lights or reduced power output due to error codes.

• DPF removal leads to increased particulate emissions, which harms the environment and public health.
• Modern engines and control units rely on the DPF for proper function; removal can cause malfunction or fines.
• Professional servicing and repair, including proper DPF replacement or regeneration, is the safe and legal approach.

Maintaining your vehicle’s DPF system helps ensure safe, low-emission driving and long-term engine health.

Cleaning a DPF at home is generally not advised due to the technical risks and potential damage to the filter’s ceramic substrate. Professional cleaning or replacement is the recommended route.

• If pressure washing is used, it must be done carefully and typically in the direction specified by professionals to avoid damage.
• Improper cleaning may cause irreparable clogging or structural damage leading to costly replacements.
• Professional workshops have equipment and expertise to safely clean or replace the DPF, restoring function and ensuring compliance.

For best results and vehicle safety, consult authorized service centers or experts experienced with Peugeot 406 DPF systems.