Here is a clear, informative breakdown of what this typically refers to in the automotive diagnostics and security field: In automotive contexts, "IMMO" stands for immobilizer — an anti-theft system that prevents the engine from starting unless the correct key or transponder is present.
It seems you're asking about — a term often associated with automotive immobilizer programming , key coding , or ECU (Engine Control Unit) unlocking tools . immo universal decoding 4.5