The BMW E46 has important data stored within the car at two primary locations. The instrument cluster and light switch module. This ensures that data cannot be lost if one device goes bad. It is similar to why aircraft have redundant flight controls if one set goes out there is another system in place as a
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BMW E46 Coupe vs. Sedan body differences The body of the E46 Coupe is not a modified version of the Sedan, rather it is a completely unique body. There are no common sheet metal parts between the Sedan and the Coupe. Only the design technology of the E46 sedan was used to create the E46 Coupe.