Most versions featured a VNT turbocharger to reduce lag and improve torque across the rev range.

The injector hold-down bolt is a "use-once" stretch bolt. Tightening a used bolt will cause it to snap inside the cylinder head.

Released as the successor to the OM611, the OM646 introduced key improvements in fuel injection and efficiency.

Carbon buildup around fuel injectors, a ticking sound, and exhaust smells inside the cabin.

: Haynes provides practical, step-by-step rebuild guides based on complete vehicle teardowns. Note that later Sprinter manuals (July 2009 onwards) typically cover the OM651 engine, so ensure you select the manual for the pre-July 2009 models for OM646 coverage.

Required for resetting adaptations, forced DPF regenerations, and injector coding. Conclusion

Using a workshop manual can have numerous benefits, including: