Mercedes R-Class Catalytic Converter W251 (2005-2017)

The catalytic converters for Mercedes R-Class W251/V251 mainly fit diesel engines OM642.950 (3.0 CDI) with power outputs of 190 HP, 211 HP, 224 HP, or 280 HP. Compatible models include R 280 CDI 4-Matic (251.020), R 320 CDI 3.0 4-Matic (251.022, 251.122, 251.125) and R 350 CDI 4-Matic (251.023, 251.123), produced between 2005 and 2017. These vehicles mostly feature all-wheel or rear-wheel drive, with manual or automatic transmissions.

Common engine features include:

• 3.0 L displacement (2987 cc), 6 cylinders
• 4 valves per cylinder
• Diesel engines compliant with Euro 4 (D4) or up to Euro 5 emission standards
• With or without Diesel Particulate Filter (DPF)
• Not fitted with SCR (Selective Catalytic Reduction) systems in most cases
• Equipped with On-Board Diagnostics (OBD)

Compatibility excludes vehicles with certain special codes such as U42/928.

The catalytic converters differ in dimensions, weight, and homologations. Key variants include:

• Length varies between approximately 310 mm and 1345 mm
• Weight typically ranges from 3.3 to 4.6 kg
• Certified to Euro 4 or Euro 5 emission standards
• Manual or automatic transmissions (5 or 7 speeds)
• Positioning mostly at the center or rear of exhaust systems
• Approved under CE/CEE certifications and E1 90R-02C*, E9-103R homologations

OEM references include OM642.950 and others specific to vehicle models and years.

Mercedes R-Class catalytic converters are available online from reputable distributors offering:

• Brand-new parts with manufacturer warranties
• Specific models for R280, R320, and R350 CDI versions
• Options with and without Diesel Particulate Filters (DPF)
• Secure online ordering and shipping

It’s recommended to verify part compatibility via the vehicle’s VIN or engine code before purchase.

To confirm compatibility, verify the following details:

• Engine model (e.g., OM642.950)
• Exact power output (e.g., 190, 211, 224, or 280 HP)
• Vehicle model and production year (2005–2017)
• Transmission type (manual or automatic)
• Presence or absence of Diesel Particulate Filter (DPF)
• OEM reference number or part number

Use online catalogs or consult technical documentation based on your vehicle’s VIN for precise identification.

Krosfou catalytic converters for Mercedes R-Class come with a 3-year warranty covering up to 100,000 km of use. They are manufactured in high-quality INOX 409 stainless steel and feature advanced monolith technology certified by TÜV SÜD, meeting or exceeding original equipment standards.

• Strict European emission regulation compliance (Euro 4 and Euro 5)
• Manufacturing certified to ISO 9001 and E24-103R homologation
• Superior durability and performance with stainless steel construction

This ensures reliable function, environmental compliance, and long-lasting quality.

Yes, technical support is available by email. Installation manuals and compatibility guides can often be provided upon request. The technical team can analyze used parts to diagnose issues and confirm the correct catalytic converter for your vehicle through VIN or OEM references.

• Email support ensures clear and documented assistance
• Installation guides cover most available references
• Expert advice on sensor positioning and fitting

Contact the supplier’s technical support team for personalised help.

Shipping options include standard and express delivery with tracking available. Orders placed before noon are usually shipped the same day if in stock. For out-of-stock items, production and delivery can take 2 to 4 days.

• Standard UK delivery: 3 to 8 working days, often free
• Express delivery options: 24 to 48 hours with additional cost
• International shipping available with varied timelines and charges
• Free returns within 30 days for unused and unmounted products

Customers are advised to check delivery times and costs per product page before ordering.

Quality packaging and secure shipping ensure parts arrive in perfect condition.