The on Mercedes-Benz Sprinter (W901-W905) and Vito (W638) models is a common fault indicating a synchronization failure between the Engine Control Unit (ECU) and the Immobilizer (WSP/DAS) module. When this happens, the engine may crank briefly and stall, or not crank at all, while "START ERROR" displays on the dashboard. Core Problem: Synchronization Failure

The most reliable fix involves clearing all key data from the ECU (making it "virgin"). Upon the next start attempt, the ECU automatically syncs with the immobilizer and writes the correct key information.

Modern vehicles, including the Mercedes Sprinter and Vito, rely on complex computer systems to manage engine performance, emissions, and safety features. When these systems detect a problem, they generate an error code that can be read with a diagnostic scan tool. These codes are essential for technicians to diagnose issues accurately.