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What are BMW E-Codes?
You will not find these numbers on your car, but E-Codes are widely used to identify BMW automobiles. E-codes were developed by BMW internally, and are so useful BMW enthusiasts discovered them and began referring to their cars using these E-Codes. They only change to signify a major redesign of a series, or the introduction of a new series.
The "E" stands for "Entwicklung", the German word for development. Every subsequent BMW model has been given a numerically higher designation at the beginning of its development program including all the prototypes and concepts, hence the gaps in the numbering sequence, the missing numbers indicate the projects that never made it to production. | 
