If you own a first-generation or an early Vito (W638) , seeing the "Start Error" message on your dashboard can be incredibly frustrating. This error is a classic immobilizer system failure that prevents the engine from cranking, often leaving drivers stranded. What is the Mercedes "Start Error"?

Using tools like the software, a technician can read the EEPROM data from both the WSP and the ECU. The software "re-syncs" these files, which are then written back to the chips. This "marries" the units back together. 3. Immobilizer Bypass (Immo-Off)

This is the #1 culprit. If your battery goes flat or you try to jump-start the van improperly, the voltage drop can "scramble" the synchronized data between the ECU and the WSP.