Mercedes-Benz Diesel

Develop a practical, diagnostic-focused understanding of the Mercedes-Benz OM642 and OM651 diesel engines. This course covers fuel, air, boost, EGR, and emissions systems while emphasizing factory information, live data, and proven test-first strategies for accurately diagnosing common drivability and performance faults.

Description

The Mercedes-Benz OM642 V6 and OM651 inline-4 diesel engines are commonly seen in platformssuch as Sprinter, E-Class, ML/GL, and other Mercedes-Benz diesel applications.

Through a systems-based and diagnostic-driven approach, class participants will explore engine architecture, fuel delivery, air management, emissions control, and common failure modes unique to these platforms.

The course emphasizes real-world diagnosis, test-first strategies, and service best practices using
factory service information and OEM-level diagnostics using a variety of OEM and aftermarket
tools and resources. Technicians will leave with the confidence to accurately diagnose
performance complaints, drivability issues, fault codes, and emissions-related failures commonly
encountered in these complex vehicles.


At the end of this course technicians will be able to:

  • Identify common OM642 and OM651 failures and apply proven service solutions
  • Describe how Mercedes-Benz common-rail diesel fuel and air management systems operate under varying conditions
  • Diagnose tricky fuel, air, and emissions-related drivability complaints using live data and fault logic
  • Test and verify fuel system performance, including low and high fuel pressure systems operation and fuel injection system
  • Tackle turbo / boost control issues with proven strategies
  • Diagnose and repair EGR and emissions system faults
  • Use a structured diagnostic approach that reduces comebacks and unnecessary parts replacement