This is a specific request, as Mercedes-Benz does not publish a single unified "Workshop Manual" for the W639 (Viano / Vito / Marco Polo) for public sale. Instead, the official information is split across the WIS (Workshop Information System) and ASRA (Work Time System).

General Information: Vehicle identification numbers (VIN), official manufacturer specifications, and special tool requirements.

, which provides systematic, step-by-step approaches to diagnosing common issues by symptom or error code. Lagos State Government Key Features for Efficient DIY Repairs Dealer-Level Instruction : High-quality manuals, such as the Mercedes Workshop Digital Manual

That night, after Ana had left and the bay had emptied, Eli sat with the manual open and a cup of coffee gone cold. He read the last pages: Josef had aged, pages blurred with fingerprints. He'd written, simply: "Tools are honest. So are people. Fix both gently."

A useful manual for the W639 should help you address these known platform issues:

If you own a Marco Polo camper:
Add the Marco Polo specific supplement (rare) – otherwise use Viano mechanical sections + separate camper electrics guide.