Mercedes Sprinter EGR Heat Exchanger / Cooler – Genuine OEM | OM642 3.0L V6 | #6421402175 (2010–2022)

DESCRIPTION:

The EGR cooler on the OM642 Sprinter is one of the platform's most well-documented high-mileage failure points — and when it goes, it doesn't just affect emissions performance. A cracked or leaking EGR cooler introduces coolant into the EGR circuit, leading to white smoke, coolant loss, and in severe cases, coolant contamination of the intake manifold. This is the Genuine Mercedes-Benz OEM EGR heat exchanger for 2010–2022 NCV3 and VS30 Sprinters with the 3.0L OM642 V6 — the correct part, built to the original specification.

What This Part Does

The EGR cooler uses engine coolant to reduce the temperature of recirculated exhaust gases before they re-enter the intake manifold. Cooler exhaust gases are denser — which reduces combustion temperatures, lowers NOx emissions, and protects the intake system from heat damage. When the internal tubes or core of the cooler develop cracks or pinholes, coolant mixes with the exhaust gas circuit, causing a cascade of symptoms that are often misdiagnosed before the cooler itself is identified.

Common Symptoms of a Failing EGR Cooler

• White smoke from the exhaust, especially at idle
• Unexplained coolant loss with no visible external leak
• Coolant residue or white buildup in the intake manifold
• Sweet smell from the exhaust
• EGR-related fault codes alongside cooling system warnings

When to Replace It

Replace the EGR cooler at the first sign of coolant loss combined with white exhaust smoke or intake contamination. Always flush and inspect the coolant system after replacement, and inspect the intake manifold for coolant residue before returning the engine to service.

Fitment

• 2010–2022 Mercedes-Benz Sprinter 2500 – 3.0L V6 Diesel (OM642)
• 2010–2022 Mercedes-Benz Sprinter 3500 – 3.0L V6 Diesel (OM642)
• 2019–2022 Mercedes-Benz Sprinter 3500XD – 3.0L V6 Diesel (OM642)
• 2010–2021 Freightliner Sprinter 2500/3500 – 3.0L V6 Diesel (OM642)

This part is VIN specific. Always verify your part number before ordering. Contact us and we'll confirm fitment before you buy.

Part Numbers

• Mercedes OEM: 6421402175 / A6421402175 / 642-140-21-75
• Supersedes: 6421401375
• SKU: 6421402175OE