Saab 9-3 Diesel Particulate Filter DPF 2 (Ii) (2002-2011)

The DPF is an anti-pollution device located in the exhaust system after the catalytic converter and before the silencer on your Saab 9-3 2 diesel. It consists of a ceramic body divided into around 50 microscopic channels per cm², trapping up to 99% of the soot particles produced by diesel combustion to reduce emissions.

The DPF cleaning occurs in two cycles:

• Passive regeneration: During low-load trips, soot accumulates inside the filter creating back pressure detected by the differential pressure sensor, signalling the engine computer that regeneration is needed.
• Active regeneration: The engine management stops the EGR valve, activates post-injection, and controls the turbo to raise exhaust gas temperature to at least 580°C to burn off soot. This process lasts 5 to 15 minutes and usually occurs every 500 to 700 km depending on driving style.

Common issues with a faulty or clogged DPF include :

• Increased fuel consumption
• Loss of engine power
• Illumination of the engine warning light
• Engine entering limp or safety mode

These problems are often triggered by short, low-temperature trips that prevent normal regeneration.

You can use a 360° cleaning machine like the Bardahl 5 in 1 that completes the cleaning in about 1 hour. This method includes :

• Injection of a specialised cleaning fluid into the filter
• Complete rinsing of the system
• Addition of a regeneration additive to the fuel
• A 20-minute road test at high engine speeds (3,000 to 4,000 rpm) to force regeneration

This non-invasive cleaning is effective for reducing soot build-up and restoring normal DPF function.

Replacement time for the DPF on this specific model is typically around 55 minutes of labour. Always ensure a qualified technician performs the replacement to maintain engine performance and emissions compliance.

To aid the DPF regeneration process and avoid clogging :

• Occasionally drive at sustained higher speeds, such as on the motorway, for at least 10-15 minutes
• Keep engine speed around 3,000 rpm during these drives
• Avoid frequent short trips at low temperatures that do not allow the DPF to reach regeneration temperature

These habits help ensure normal passive and active regenerations and prolong the life of your DPF.

Signs of a clogged DPF include :

• Frequent engine warning light or DPF full message on the dashboard
• Reduced engine power and acceleration
• Elevated fuel consumption
• Engine entering limp mode for protection

If you notice any of these symptoms, consult a professional to assess the DPF condition and recommend cleaning or replacement if necessary.

For extended knowledge and community support, consider :

• Specialised Saab forums such as the Saab Sport Club for discussions on DPF maintenance and modifications
• Technical websites offering detailed articles on Saab DPF clogging and regeneration
• Online platforms providing genuine DPF spare parts with exact specifications
• Video tutorials on YouTube from brands like Bardahl demonstrating DPF cleaning procedures

Accessing these resources can improve your understanding and help you maintain your vehicle’s emission system effectively.