Mercedes CL-Class Catalytic Converter

The catalytic converter in a Mercedes CL-Class (models C215 1999-2006 and C216 2006-2014) is an essential part of the exhaust system. It transforms harmful gases such as carbon monoxide (CO), unburned hydrocarbons (HC), and nitrogen oxides (NOx) into less harmful substances like carbon dioxide (CO2) and water (H2O) through chemical catalysis using precious metals such as platinum, palladium, and rhodium. It is positioned near the engine to quickly reach its optimal operating temperature of about 420°C and features a honeycomb ceramic structure to maximize gas contact and conversion efficiency.

The catalytic converter performs key chemical reactions:

• Reduction of nitrogen oxides (NOx) via rhodium and platinum.
• Oxidation of carbon monoxide (CO) and hydrocarbons (HC) into carbon dioxide (CO2) and water using platinum and palladium.

Mercedes CL-Class gasoline engines use a three-way catalytic converter to treat CO, HC, and NOx simultaneously. The system includes two oxygen sensors (before and after the catalytic converter) which monitor its efficiency. A fault triggers the engine warning light and may cause the engine to run in a limp mode with poorer air/fuel mixture.

Typical signs of catalytic converter failure include:

• Loss of engine power and unstable idle.
• Increased fuel consumption due to emergency ECU mode.
• Unpleasant sulfur-like odors and unusual rattling noises.
• Excessive heat around the catalytic converter area.
• Error codes such as P0420 or P0430 indicating low efficiency.

Failure causes include over-fueling, oil contamination, overheating, or clogged honeycomb cells. Note that Mercedes catalytic converters are often targeted by thieves because of their precious metal content.

The price for a new catalytic converter for a Mercedes CL-Class varies between approximately €800 to €2500 depending on the model and whether OEM or aftermarket parts are used. The labor cost can add 2 to 4 hours of garage time. The precious metals inside (platinum, rhodium) significantly influence the price. It is important to avoid counterfeit parts that may not meet Euro4 or Euro5 conformity standards applicable to CL-Class vehicles.

Typical OEM references include:

• C215 (1999-2006) with M113 V8 engine: A1134900800 / A1134901900 - usually in pairs (left/right side).
• C216 (2006-2014) with M273 V8 engine: A2734900200 - possibly a close-coupled type for Euro5 compliance.

Professional installation and replacement of related components — such as oxygen sensors — is strongly recommended.

Key maintenance tips include:

• Use premium unleaded fuel with high octane (e.g., SP98) to reduce deposits.
• Avoid frequent short trips that prevent the converter from reaching optimal temperature.
• Regular oil changes to prevent contamination inside the catalytic converter.
• Scan your vehicle periodically with an OBD2 tool to check for typical fault codes like P0420.

Following these recommendations helps prevent clogging or damage and ensures efficient emission control.

Mercedes CL-Class gasoline engines predominantly use a three-way catalytic converter that simultaneously reduces CO, HC, and NOx emissions. There can be close-coupled catalytic converters located close to the exhaust manifold, providing faster heating to optimal temperature.

Diesel SCR type converters with AdBlue injection are less common on CL-Class models. The catalytic converters contain a ceramic honeycomb structure coated with precious metals such as platinum, palladium, and rhodium to ensure maximum conversion efficiency and durability.

Catalytic converters on Mercedes CL-Class vehicles contain a substantial amount of precious metals like platinum, palladium, and rhodium, which makes them valuable for recycling and resale. The value depends on the weight and condition of the converter and precious metal content:

• Platinum content: approximately 30-50 grams per unit.
• Rhodium content: approximately 5-10 grams per unit.

This high content drives up prices in the scrap market and unfortunately leads to frequent theft of these components.

Krosfou offers brand-new, high-performance catalytic converters manufactured in Europe with the highest quality standards. Delivery options include:

• Europe: Standard delivery 1 to 6 working days, free for orders over €157.50 excl. VAT.
• Express delivery 24 to 48 hours available at extra cost.
• International delivery: standard 8-15 working days, express 2-4 working days.

Orders placed before noon for in-stock items ship the same day. Out-of-stock items can be manufactured in 2 working days and shipped via express.

All new parts come with a 3-year warranty limited to 100,000 kilometers of usage and include free returns within 30 days, subject to product being unused and in original condition.