Mercedes Citan Diesel Particulate Filter DPF (2012-2021)

The Diesel Particulate Filter (DPF) is a critical component in modern diesel engines like the Mercedes Citan 1.5 CDI. It is designed to capture soot particles from the engine’s exhaust gas to reduce harmful emissions and help the vehicle comply with environmental standards such as Euro 5. The filter traps particles to prevent them from being released into the atmosphere, thus playing an essential role in keeping the air cleaner.

The Diesel Particulate Filter for the Mercedes Citan 415 109 CDI 1.5 90 HP Diesel features:

• Engine code: OM 607.951 (K9K)
• Weight: Approximately 6800 grams
• Emission standard: Euro 5 compliant
• Applicable for models from 2012 onwards

This DPF ensures the vehicle meets strict pollution emission requirements while maintaining engine performance.

Signs indicating potential problems with the DPF include:

• Warning lights: A yellow light signals the DPF is filling and requires regeneration; a red light means the filter is full and engine power might be reduced to protect the engine.
• Engine power loss: A clogged DPF restricts exhaust flow, causing decreased engine performance.
• Increased fuel consumption: The engine works harder with a blocked filter, using more fuel.
• Black smoke from exhaust: Visible smoke indicates filtration issues.

Early detection and checkups in a garage can prevent further damage.

The DPF uses two main regeneration methods to burn off trapped soot:

• Passive regeneration: Happens naturally at high engine temperatures during highway driving, where soot is automatically burned without driver intervention.
• Active regeneration: Initiated by the engine during urban or stop-and-go driving by injecting extra fuel to increase exhaust temperature, burning the soot inside the filter.

Failure in regeneration can cause clogging and requires professional inspection.

To keep the DPF in good condition, consider these options:

• Regular long-distance driving to enable natural passive regeneration.
• Chemical cleaning products that clean the DPF without needing removal.
• Physical cleaning in workshops using high-pressure or ultrasonic cleaning after removing the filter.

Proper cleaning restores engine power and eliminates black smoke.

DPF replacement may be required under conditions such as:

• Severe damage to the filter structure.
• Vehicle mileage exceeding 150,000 km without effective regeneration.
• When the DPF is no longer cleanable or repairable.

Replacement should be done with certified, original-quality parts for reliable engine and emissions performance.

Certified, original-quality replacement DPFs manufactured to meet or exceed OEM standards are available from specialized providers. These filters are produced in Europe using high-grade materials such as stainless steel and advanced ceramic monoliths. They come with warranties and comply with current emission regulations, ensuring durability and performance equal to or better than the original parts.

Consider ordering directly from manufacturers that guarantee full compliance and quality certification (e.g., TÜV SÜD Certified).

Maintaining the DPF for long-term health involves:

• Regularly driving at higher speeds on open roads to enable passive regeneration.
• Timely servicing and inspection of the exhaust and engine management systems in your garage.
• Monitoring and promptly reacting to dashboard DPF warning lights.
• Consulting a specialist if you notice any reduction in engine power, increased fuel consumption, or visible smoke emissions.

Proactive care extends the life of the DPF and ensures your Mercedes Citan meets emission standards.

Always ensure maintenance and any replacements are performed by qualified professionals using appropriate parts.