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Variant Code Structure BMW 5 series E39 facelift

Variant Code Structure

The four digit structure of the variant code is a two word hex code. Each hex character provides specific control module encoding information

Scheme 305

Scheme 305: Variant Code Structure

Each hex digit has a binary equivalent that provides four 1s or Os. This provides a total of 16 bits of information (or choices).

The control module assigns specific functions, characteristic maps and control module program constants based on the individual 1s and Os.

Scheme 306

Scheme 306

Intentionally miscoding a DME will not create any performance advantages and quite possibly could lead to engine damage.