Mercedes CLC-Class Diesel Particulate Filter DPF Cl203 (2000-2011)

The Diesel Particulate Filter (DPF) fitted on the Mercedes CLC-Class CL203, notably on diesel versions like the CLC 200 CDI (OM 646.962) and CLC 220 CDI (OM 646.963), is an essential exhaust system component designed to comply with Euro 4 emission standards. Typically made from silicon carbide or cordierite, it captures fine particulate matter from the engine exhaust to reduce pollution.

Common models and specs include:

• CLC 220 CDI (203.708) - Engine OM 646.963; fitted to meet Euro 4 standards; OEM ref 8LH 366 081-141; max ash 60 g.
• CLC 200 CDI (203.707) - Engine OM 646.962; 122 HP 2.2L Diesel; compatible materials and mounting systems required.
• CLC Diesel 2008-2011 (CL203) - OEM references like 2034900092 for optimal particulate reduction.

Filter dimensions range from 340 to 680 mm in length, weighing between 4.27 to 6.78 kg, suitable for both left- and right-hand drive vehicles.

Most DPFs for the Mercedes CLC CL203 are manufactured using either:

• Silicon carbide (carbide de silicium) – known for its high thermal resistance and efficiency in trapping particulates.
• Cordierite – valued for its thermal stability and cost-effectiveness.

These materials ensure durability, effective filtration, and compliance with emission standards.

DPF regeneration, which clears trapped soot from the filter, can be done in two main ways:

• Passive regeneration: driving steadily at speeds of 60-80 km/h for about 25 to 30 minutes helps burn off accumulated ash (up to a max of 60 grams).
• Active regeneration: using diagnostic tools such as VCDS to force regeneration when passive methods are insufficient.

Regular maintenance following these guidelines helps to ensure optimal filter performance and longevity.

DPFs designed for the Mercedes CLC-Class CL203 are generally not adapted for use with biodiesel blends. Using biodiesel can lead to quicker clogging and potential filter damage. Always check vehicle specifications and fuel compatibility before using biodiesel in diesel vehicles equipped with a DPF.

Common signs indicating issues with the DPF include:

• Warning lights or error messages related to the exhaust or emissions on the dashboard.
• Loss of engine power or reduced fuel economy.
• Increased exhaust pressure detected by sensors.
• Unusual smells or excessive smoke from the exhaust.

If these symptoms appear, it is advisable to perform a professional check and consider cleaning or replacing the filter.

The DPF is located within the vehicle’s exhaust system, commonly integrated near the catalytic converter and downstream from the exhaust manifold. Its exact position can vary depending on the vehicle’s configuration (left- or right-hand drive and specific model year) but generally is accessible for service or replacement.

Proper maintenance and service options include:

• Periodic passive regeneration by maintaining consistent speeds (60-80 km/h) over 25-30 minutes.
• Using professional DPF cleaning sprays or aerosols specifically designed for diesel filters to remove ash and soot build-up.
• Regular diagnostic checks with tools like VCDS to monitor sensor signals and force active regeneration if needed.
• Timely replacement with high-quality, original standard DPF units when the filter is beyond cleaning.

Following manufacturer guidelines and professional advice ensures the DPF operates efficiently, prolonging vehicle life and saving money on costly repairs.