Mercedes CLS-Class Diesel Particulate Filter DPF

The Diesel Particulate Filter (DPF) in the Mercedes CLS-Class Diesel, such as the CLS 350 CDI (C218) or CLS 320 CDI (C219), captures soot particles from exhaust gases to meet emission standards. It requires periodic regeneration by burning soot at high temperatures (450-550°C with fuel additives) or cleaning/replacement typically between 145,000 and 185,000 km to maintain optimal engine and emission performance.

Symptoms of a faulty or clogged DPF in a Mercedes CLS include:

• Loss of engine power and activation of limp mode (engine safety mode)
• Increased fuel consumption
• Check Engine light on, potentially with fault codes such as 246 309 indicating excessive particulate load
• High differential pressure readings showing soot overloading inside the filter

Addressing these symptoms early is crucial to avoid expensive repairs or replacement of DPF and connected parts.

The DPF is fitted underneath the vehicle, integrated into the exhaust system, sometimes alongside the catalytic converter especially in 4MATIC models. Typical removal involves safely lifting the vehicle, disconnecting the differential pressure sensor hoses, temperature and gas sensors, and flexible pipes before detaching the DPF for cleaning or replacement.

• Replacing the differential pressure sensor and its hoses during service is strongly recommended
• Tutorial videos for similar Mercedes models (B, C, E Class) demonstrate the process effectively

Professional service ensures correct handling and protects vehicle emissions integrity.

DPF regeneration is essential to burn off soot collected in the particulate filter:

• Passive Regeneration: Occurs automatically during driving at speeds of 60-80 km/h for 25-30 minutes, reaching necessary combustion temperature (450-550°C).
• Forced Regeneration: Performed via diagnostic tools or by sustained driving in higher RPM modes; may fail if clogging is severe.
• Professional Cleaning: DPF can be removed and professionally cleaned with reverse flushing and flow testing if regeneration fails.
• Fuel Additives: Used to lower soot combustion temperature to around 450°C, improving regeneration efficiency.

Avoid frequent short trips that hinder effective regeneration and shorten DPF life.

Key details for Mercedes CLS-Class DPF replacement include:

• Original Equipment (OE) number e.g. 2124902192 for C218 model
• Materials used: Cordierite (5.5 kg) or Silicon Carbide (6.4 kg) monoliths with stainless steel casing
• Service interval: approximately 145,000 to 185,000 km depending on model and usage
• Replacement should also consider upstream/downstream catalytic converters and sensors for full system integrity

Using certified, high-quality DPF parts ensures compliance with emission standards and durability.

To maintain your DPF and avoid costly issues:

• Avoid repeated forced regenerations without proper diagnostics
• Minimize frequent short journeys that do not allow engine and DPF to reach operating temperatures
• Regularly replace the differential pressure sensor and related parts during service
• Use recommended fuel additives to support regeneration at lower temperature
• Follow scheduled engine oil and vehicle maintenance to prevent premature DPF clogging

Engaging with technical forums for CLS models can also provide community insights on managing DPF performance.

DPF regeneration removes deposited soot through controlled combustion:

• Passive regeneration happens during normal driving conditions once the exhaust system reaches ~450-550°C
• Forced regeneration is initiated by diagnostic tools or specific driving modes to manually burn off excess soot
• Incomplete regeneration often causes DPF clogging and fault codes

Regular and complete regeneration cycles are essential for maintaining engine power and fuel efficiency, as well as preventing check engine warnings related to the DPF.

Krosfou offers original, high-performance DPFs for Mercedes CLS-Class with the following assurances:

• 100% European manufacturing with TÜV SÜD certified quality
• Made with INOX 409 stainless steel and advanced monolith coating technology
• 3-year warranty limited to 100,000 km usage under proper installation and maintenance conditions
• Free returns within 30 days for unused, original condition products in Europe

Ordering directly from the factory ensures access to durable, reliable, and regulation-compliant DPFs designed to restore your vehicle's performance and reduce emissions effectively.