Mercedes GLS-Class Catalytic Converter X166 (2015-2019)

The catalytic converter in the Mercedes GLS-Class X166 is a key exhaust component that reduces harmful vehicle emissions to comply with Euro standards (1 to 6 depending on engine type). It works by oxidizing and converting pollutants in exhaust gases before they exit the vehicle’s exhaust system.

Various new and original catalytic converters are compatible, designed specifically for engine codes and Euro standards of GLS X166 models. Examples include:

• Euro 2 models for engines OM604.912, OM605.912, OM605.962
• 3-way catalytic converters with Lambda sensors for M278 DE46 petrol engines
• Oxidation catalytic converters plus DPF for diesel engines such as OM642 and OM651 series
• OEM reference A1664903914 for GLS/GL X166 4.7 V8 vehicles

Always verify compatibility with your vehicle’s registration and engine code before purchase.

The 3-way catalytic converter is commonly used in the petrol GLS 500 4MATIC (2016-2019) model with:

• Engine code: M278 DE46
• Specifications: 3-way catalytic converter plus Lambda sensor
• Transmission: 9G-Tronic gearbox

These parts are high quality and often have limited stock due to demand.

The diesel GLS 350 d 4MATIC (2016-2019) uses:

• An oxidation catalytic converter combined with a DPF (Diesel Particulate Filter) and a system for NOx reduction
• A cleanable DPF module (e.g., reference FAO D1376) compatible with W166/X166 series
• Motors OM642 LS DE30 and similar

This setup reduces particulate emissions and nitrogen oxides, helping meet Euro 5/6 standards.

Prices for new catalytic converters vary from approximately €639 upwards depending on size and weight. Larger or heavier units cost more. Some details:

• Prices exclude VAT of 20% and delivery charges
• Stocks of over 100 units are commonly available in Europe
• Used catalytic converters can have scrap values from roughly $97 up to $926 based on precious metal content

Market values are based on the quantity of precious metals like platinum, palladium, and rhodium within the catalytic monolith.

Yes, complementary parts important for proper exhaust system function include:

• Lambda sensors (for measuring exhaust gases and NOx)
• Temperature sensors for gas monitoring
• Diesel Particulate Filters (DPF) with cleaning kits
• Turbo-related components (excluding turbochargers themselves)

Regular maintenance and cleaning of DPFs are recommended to maintain vehicle power and reduce emissions properly.

For guaranteed quality and performance, choose catalytic converters manufactured with:

• High-grade stainless steel (INOX 409)
• Technologically advanced monoliths with rare metal coatings
• Full compliance with European regulations and OEM standards
• 3-year manufacturer warranty covering up to 100,000 km usage

Always verify the part’s compatibility by vehicle registration and engine code, and follow manufacturer installation instructions to ensure optimal function.

Detailed technical specifications, compatibility guides, and pricing are available through specialised automotive parts distributors offering:

• Online catalogues with VIN and engine code compatibility checks
• Comprehensive product details including dimensions, Euro standards, and sensor positioning
• Dedicated technical support and installation guides
• Professional accounts with discounts, fast shipping, and loyalty programs

Choosing certified, direct-from-factory quality products ensures durability, vehicle power retention, and environmental compliance.

For precise purchasing, always enter your vehicle registration or VIN code on the supplier website to confirm exact fitment and product suitability.