Mercedes C-Class Catalytic Converter

The catalytic converter in a Mercedes C-Class is a key component of the exhaust system designed to reduce harmful emissions. It converts toxic gases produced by engine combustion — carbon monoxide (CO), unburned hydrocarbons (HC), and nitrogen oxides (NOx) — into less harmful substances like carbon dioxide (CO₂) and water vapor (H₂O) through chemical oxidation and reduction reactions.

Typically weighing between 1 to 10 kg, it is positioned close to the engine to reach its ideal operating temperature of at least 420°C quickly, ensuring effective cleaning without clogging.

Mercedes C-Class gasoline engines mainly use three-way catalytic converters which treat CO, HC, and NOx emissions with precious metals such as platinum, palladium, and rhodium coated on a ceramic honeycomb substrate for maximum surface area.

Diesel models use two-way catalytic converters to treat CO and HC, while NOx emissions are managed separately by systems such as Selective Catalytic Reduction (SCR) or Exhaust Gas Recirculation (EGR).

The catalytic converter works alongside several components for optimal emission control:

• Oxygen sensors (lambda sensors) placed before and after the catalytic converter to measure air/fuel mixture and help optimize the catalytic reaction while detecting failures.
• Diesel Particulate Filter (DPF) in diesel models that traps fine carbon particles.
• Other exhaust parts like silencers (mufflers) that reduce noise but are separate from the catalytic function.

A typical exhaust flow: exhaust manifold → catalytic converter → oxygen sensors → DPF (diesel) → muffler → tailpipe.

Common signs of catalytic converter failure include:

• Loss of engine power and reduced performance.
• Increased fuel consumption.
• A noticeable sulfur or rotten egg smell from the exhaust.
• Illuminated engine warning light, often accompanied by fault codes via oxygen sensors.
• Unusual noises from the exhaust system.
• Failed emissions tests or vehicle inspection due to high pollutant levels.

If you experience these symptoms, it is advisable to have an OBD diagnostic check performed to confirm the catalytic converter’s condition.

Key causes of catalytic converter failure include:

• Clogging due to the converter not reaching operating temperature—common on short trips.
• Contamination from poor-quality fuel or improper air/fuel mixture.
• Overheating from engine misfire or excessive unburned fuel entering the converter.

Proper vehicle maintenance and fuel quality are essential to avoid these issues.

For replacements or repairs:

• Professional tools and knowledge are required, including wrenches and possibly welding equipment.
• Follow detailed step-by-step guides specific for Mercedes C-Class models (W202 to W205), considering whether the engine is gasoline or diesel.
• The oxygen sensors should be replaced along with the catalytic converter to ensure proper emission control and system compatibility.
• Respect emission regulations; removal or disabling of the catalytic converter is illegal and harmful to the environment.

Krosfou offers high-quality direct-fit catalytic converters manufactured in Europe with a 3-year warranty for Mercedes C-Class vehicles.

Krosfou supplies catalytic converters that meet strict European emission standards and often comply with regulatory requirements such as the EPA or California CARB, ensuring fit and function for your vehicle's specific model year and regional emission regulations.

• Always select a catalytic converter compliant with your local emission laws.
• Use compatible OEM-quality parts to maintain vehicle performance and legal compliance.

Consult product descriptions and technical support for compatibility and certification details.

Krosfou offers a 3-year warranty limited to 100,000 kilometers for its new, high-performance stainless steel catalytic converters. This warranty covers manufacturing defects and performance issues under proper installation and use conditions.

• Products are shipped with full factory support, including technical assistance.
• Free returns are accepted within 30 days for unused and undamaged products in original packaging.
• Fast production and shipping for hard-to-find or rare catalytic converters, with express delivery options available.

Customers are advised to ensure installation by qualified professionals and to follow manufacturer maintenance recommendations to maintain warranty validity.