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

The Mercedes-Benz GLS-Class X166 is a full-size luxury SUV produced from 2012 to 2019. It features various powerful petrol and diesel engines fitted with catalytic converters to meet emission standards. Petrol models use 3-way catalytic converters with Lambda sensors, while diesel variants include oxidation catalysts, Diesel Particulate Filters (DPF), and SCR systems for NOx reduction.

Key engine and catalytic converter specifications include:

• GLS 500 4MATIC (2016-2019): 4.7L V8 biturbo petrol engine with a 3-way catalytic converter and O2 sensor for emission control.
• GLS 350 d 4MATIC (2016-2019): 3.0L V6 diesel engine with an oxidation catalyst, DPF, and SCR AdBlue system for NOx reduction.
• Other variants such as GL 450 4MATIC with a 4.7L V8 biturbo engine and GL 63 AMG with a V8 5.5L engine.

All models feature Lambda sensors before and after the catalytic converter for onboard diagnostic compliance (OBD-II).

Aftermarket options include high-quality stainless steel sport exhausts and turbo downpipe kits compatible with original catalytic converters, such as Supersprint systems for models like the GL 450 X166 (2012-2015). Examples include:

• Turbo downpipe with metallic catalytic converter replacements compatible with O2 sensors.
• Full center pipe and catalytic converter kits.
• Rear silencers and styled exhaust outlets inspired by AMG GL63.
• Race-spec downpipe options without catalytic converters (for track use only).

Note that removing the catalytic converter or using race-only components can trigger OBD fault codes and may require ECU reprogramming. Use only road-legal parts crafted for your engine's specifications.

Catalytic converters for this vehicle must comply with European regulations, including the EU norm 70/157/EEC for emission control and OBD-II standards. The converters must be matched to the engine's displacement and fuel type (petrol or diesel). Lambda sensors and other emissions systems ensure legal conformity and optimal exhaust gas treatment.

• Use of original or certified aftermarket catalytic converters is essential to meet these emissions standards.
• Removal or bypassing of catalytic converters is illegal on public roads and can cause diagnostic errors.

Always verify part compatibility using your vehicle's VIN and consult qualified professionals for installation.

High-quality new catalytic converters, like those from premium manufacturers, are made from stainless steel and advanced ceramic monoliths, ensuring exceptional durability and performance. Such products often come with warranties covering up to 3 years or 100,000 km under normal use.

• Warranty typically requires proper professional installation, use of original Lambda sensors, and adherence to engine maintenance schedules.
• Misuse, neglect, or using parts not adapted to engine specifications can void warranties.
• Carbon buildup or clogging DPFs need proper vehicle usage to ensure filter regeneration and longevity.

Choosing certified original or premium aftermarket catalytic converters ensures reliability, compliance, and sustained vehicle power output.

Catalytic converters generally do not require regular cleaning if the engine is well maintained and runs optimally. However, some common advice and considerations include:

• Ensure the engine reaches operating temperature regularly to allow catalytic converters and DPFs to regenerate properly.
• Some products claim to clean catalytic converters by adding fuel additives, but their effectiveness is debated and they are not a guaranteed solution.
• If you experience diagnostic trouble codes related to catalytic converter inefficiency (e.g., P0420), professional inspection and possible replacement may be necessary.

Always consult a qualified mechanic for diagnostic and maintenance advice regarding your catalytic converter.

Catalytic converters play a crucial role in reducing harmful exhaust emissions such as carbon monoxide, hydrocarbons, and nitrogen oxides. Their value comes from:

• Use of rare metals in the honeycomb monolith that catalyzes chemical reactions to clean exhaust gases.
• Legal importance: They help vehicles comply with stringent emission regulations across Europe.
• Environmental impact: Reducing pollution and contributing to cleaner air.

Because of the expensive metals involved, catalytic converters also hold significant scrap value but should never be removed or tampered with for resale if intended for road use.

Costs for genuine and high-quality catalytic converters can range broadly depending on engine model and part specifics. Factors influencing pricing include:

• Engine size and fuel type (petrol or diesel).
• OEM vs. premium aftermarket product quality and warranty.
• Additional components like sensors included with the catalytic converter kit.
• Shipping and regional taxes for delivery.

Typical price range for a catalytic converter may vary from approximately €1,500 to over €4,000 each side for certain V8 models. Always verify compatibility and consult official sellers for accurate quotes and availability.

Remember, cheaper aftermarket options might compromise quality and regulatory compliance.