A brand spokesman told Autocar that the super-saloon model, which produces 425bhp from its turbocharged straight-six, would need a new particulate filter in order to meet the requirements of the new Worldwide Harmonised Light Vehicle Test Procedure (WLTP).
The rehomologation process that follows such a change would prevent the updated M3 from making it to market before the next-generation 3 Series is revealed in October. As such, BMW has chosen to pull the car early and end its production alongside the rest of the 3 Series range, rather than keep it in production for longer the way it has with its forebears.
No such scenario will be applicable for the M3’s two-door equivalent, the M4, because that car and its 4 Series siblings will remain on sale into the following year. The spokesman said that the M4 would go off sale “for a couple of months” while it is rehomologated, but that it would return to showrooms with its WLTP-certified filter.