Fiat Punto Diesel Particulate Filter DPF

The Diesel Particulate Filter (DPF) is a mandatory anti-pollution device fitted on Fiat Punto diesel engines (such as the Punto Evo or Grande Punto 1.3 Multijet). It is located after the catalytic converter and before the exhaust silencer, designed to trap up to 99% of fine particles (soot and ash) from diesel combustion, significantly reducing pollution and carcinogenic risks.

The DPF alternates between two main cycles:

• Filtration: Exhaust gases pass through porous ceramic walls trapping solid particles as soot, which accumulates on the filter walls.
• Regeneration: The soot is burned off either passively or actively to clean the filter and reduce backpressure.

Passive regeneration occurs naturally at high temperatures (above 600°C) typically on motorways driving at 60-80 km/h for 25-30 minutes. Active regeneration is electronically controlled during city or short trips by post-injection of fuel and temporary adjustments to the turbo and EGR system, heating exhaust gases to burn the soot every 500-1000 km, lasting about 5-15 minutes.

Common issues arise mainly from frequent short trips (under 10 km) and city driving which prevent effective regeneration, causing soot build-up and high backpressure.

• Loss of engine power and entering limp mode
• Illumination of warning lights
• Unusual burnt odours
• Increased fuel consumption
• Visible black smoke from exhaust

If ignored, this can lead to engine oil contamination due to fuel dilution and further costly repairs.

Maintenance and repair options include:

• Manual forced regeneration via diagnostic tool (OBD) to activate cleaning cycles, especially useful in city driving conditions.
• Use of fuel additives to lower soot combustion temperature.
• Chemical or ultrasonic cleaning to remove soot and extend filter life.
• Replacement of the DPF if cleaning is ineffective; professional diagnostic required before replacement.

Regular motorway driving and periodic oil changes help optimise DPF function and longevity.

Removing or bypassing the DPF is illegal in the UK and EU as it compromises pollution control and fails vehicle inspections. Electronic and mechanical removal options exist but are not recommended nor legal. Always comply with environmental regulations by maintaining a correctly functioning DPF system.

When the DPF is clogged or regeneration is incomplete, unburnt fuel can dilute the engine oil, causing faster degradation and increased wear. This typically happens in degraded mode during heavy soot build-up.

• Oil level may rise abnormally
• Reduced lubricating efficiency
• Recommended frequent oil checks and changes

Proper DPF maintenance helps preserve oil quality and engine health.

Fiat Punto Evo and Grande Punto fitted with the 1.3 Multijet diesel engine are known to be sensitive to DPF clogging, especially if mostly used for short urban trips. Following recommended driving at 60-80 km/h for 25-30 minutes on highways regularly helps prevent issues.

High-quality DPF replacements certified to meet or exceed original specifications are available direct from specialised manufacturers. These DPFs are made with robust ceramic and stainless steel materials and come with a 3-year warranty covering up to 100,000 km of use.

• New parts only (no reconditioned or refurbished units)
• Manufactured in Europe with TÜV SÜD certification for quality and environmental compliance
• Fitted with advanced honeycomb monoliths treated with rare metals for performance and durability

For guaranteed compatibility and expert advice, consult a professional Fiat garage or trusted parts supplier.

Regular diagnostics and checks with a professional tool help identify DPF issues early to avoid breakdown and costly repairs.