Ford Focus Diesel Particulate Filter DPF

The Diesel Particulate Filter (DPF) on Ford Focus diesel models, such as the 1.6 TDCi and 2.0 TDCi, is a ceramic component integrated into the exhaust line, usually positioned after the catalytic converter. It traps harmful fine soot particles from exhaust gases to reduce pollution and protect the environment. The DPF contains sensors like temperature and pressure sensors to monitor soot levels for optimal performance.

DPF regeneration is essential to burn off accumulated soot at high temperatures (550-600°C). It happens in several ways on the Ford Focus:

• Passive regeneration: Occurs automatically during highway driving when exhaust gases are hot enough to burn soot.
• Active regeneration: Triggered by the engine control unit (ECU) injecting fuel into the exhaust to raise temperature when driving conditions are not sufficient for passive regeneration.
• Forced regeneration: Carried out using diagnostic tools when soot levels are critically high (over 40-50g) and regular regeneration fails.

Ford advises consulting a dealer if forced regeneration is necessary.

Signs of malfunction include:

• Illumination of the DPF or engine warning light on the dashboard.
• Reduced engine power due to blocked exhaust gases.
• Decreased engine performance caused by soot build-up inside the DPF.
• Frequent clogging especially in Focus 2.0 TDCi models when used for short, city trips.

Once soot exceeds 50g, the DPF often requires replacement as regeneration becomes impossible.

DPF maintenance involves regular soot burning through driving at appropriate speeds to enable regeneration. Additional methods include:

• Chemical cleaning using dissolving products combined with engine idling and driving to evacuate residues.
• Professional diagnostic-led regeneration when the DPF warning light appears.
• Replacement of the DPF if clogged beyond cleaning.

Avoid allowing exhaust gases to enter the engine compartment to reduce risks. Ford recommends addressing DPF issues at authorized service centers and consulting vehicle manuals for specific guidance.

Many modern Ford Focus diesel models, including some 1.6 TDCi and 2.0 TDCi variants, are equipped with stop-start systems designed to reduce emissions and fuel consumption during idling. This system can affect DPF regeneration, so proper driving habits are recommended to ensure the DPF operates correctly.

Modern DPFs on Ford Focus models are coated with advanced thin layers using rare metals applied on the ceramic monolith structure. This coating maximizes soot capture efficiency and durability, supports effective regeneration at required temperatures, and contributes to lower emissions and better engine output.

Krosfou's DPFs are manufactured with high-grade ceramics and INOX 409 stainless steel, certified for superior quality and compliance with European regulations.

Some modern diesel Ford Focus models are equipped with Selective Catalytic Reduction (SCR) systems that use AdBlue to reduce nitrogen oxide (NOx) emissions. While AdBlue helps the catalytic converter system, it is distinct from the DPF, which focuses on particulate matter. Knowing your specific model’s features is essential for proper emission system management.

If the DPF or engine warning light appears, it indicates increased soot levels or sensor issues. Recommended steps include:

• Performing a diagnostic check using an OBD tool to read fault codes such as P242F.
• Following prescribed regeneration procedures, which may be passive, active, or forced.
• Checking related sensors like pressure and temperature sensors for correct operation.
• Consulting a certified mechanic or authorized Ford service center if faults persist.

Regular monitoring, diagnostic testing, and addressing faults early can prevent DPF clogging and costly replacements.