Smart Fortwo Diesel Particulate Filter DPF

The Diesel Particulate Filter (DPF) on a Smart Fortwo diesel, particularly on models like the Fortwo Coupé 0.8 CDi (2007 onwards) with engines WDB451300/WDB451301, is an exhaust component positioned after the catalytic converter. It captures pollutant particles from exhaust gases to reduce emissions. The filter is made from ceramic or cordierite and uses a differential pressure sensor to detect soot accumulation inside the filter.

Common symptoms of a clogged DPF include:

• The DPF warning light on the dashboard lighting up.
• Loss of engine power or reduced performance.
• Excessive smoke from the exhaust pipe.
• Error codes related to exhaust or emission system detected by diagnostic tools.

Ignoring these signs can risk engine damage or failure to pass MOT emissions tests.

DPF regeneration is the process of burning off accumulated soot in the filter to clean it. On the Smart Fortwo 451 diesel models, regeneration can occur automatically or be forced during servicing. The process requires elevated exhaust temperature, often achieved by driving at higher RPMs or longer journeys.

• Automatic regeneration cycles burn soot during normal driving conditions.
• Forced regeneration is performed by a mechanic if automatic cleaning fails.

Regular driving habits that allow the engine to reach normal operating temperature help maintain DPF cleanliness.

To prevent DPF issues:

• Monitor the DPF warning light and address it promptly.
• Use high-quality diesel fuel to reduce soot production.
• Drive the car periodically at higher engine speeds to allow automatic regeneration to complete.
• Have regular servicing including DPF status checks and sensor inspections.

This preventive care reduces the risk of filter blockage and costly replacements.

Replacement is recommended if the DPF is severely blocked and cannot regenerate properly. The procedure involves:

• Removing the exhaust system parts to access the DPF.
• Replacing it with a new, high-quality DPF compliant with Euro 4 emission standards.
• Reinstalling and testing the system to ensure proper performance.

Replacement parts come with a 3-year warranty and should be fitted by professionals to avoid complications.

Common OEM part references for Smart Fortwo diesel DPFs include A4514900581, A4514901081, A4514901181, and A4514901781. Prices for new DPFs typically start around €371 including VAT and vary depending on model and supplier. High-quality parts are manufactured in stainless steel with advanced ceramic monoliths, ensuring durability and compliance with environmental regulations.

• Includes warranty and quality assurance.
• Usually available with delivery in a few days.

Always source your DPFs from reputable suppliers to guarantee compatibility and performance.

Diagnosis involves:

• Checking for the DPF warning light on the dashboard.
• Using diagnostic tools to read fault codes related to the exhaust or DPF system.
• Inspecting the differential pressure sensor readings to assess soot buildup.
• Observing any loss of engine power, increased smoke, or unusual exhaust smells.

Diagnostic help and tutorials are available online, but professional assessment is recommended for thorough checks.

Various online resources provide detailed information, parts, and tutorials for Smart Fortwo DPF maintenance and replacement:

• Official brand support and technical documentation
• Automotive forums dedicated to Smart Fortwo and diesel engine care
• Websites offering procedural guides and cleaning tips
• Specialist suppliers providing genuine, certified DPF parts with warranty

Always verify part compatibility via VIN and consult professionals when in doubt to ensure proper care of your DPF and exhaust system.

Choosing certified European-manufactured parts ensures compliance with environmental standards and optimal vehicle performance.