IMMO guideNo-Start Diagnosis: Immobiliser or Not

This guide teaches a lawful owner or their technician how to separate a genuine immobiliser fault from a fuel or spark no-start condition using observation, basic electrical tests and scan-tool data, so the correct repair route is chosen before any money is spent. It explains how the immobiliser and key authentication chain works, what ownership documents prove authorisation, and how to select between a franchised dealer and a registered automotive locksmith when security work is required. You will learn what happens during diagnosis and key programming, how to verify the repair with a repeatable start-and-restart check, and how to spot scams and prevent a repeat failure through key care and battery maintenance. Every procedure stays at the manufacturer-approved level, with exact values and menu paths confirmed in the factory service information for the specific vehicle.