Can you swap an ecu from a m reg lsi into an l reg esi without having a dealer re-code the ecu?

Swapping an ECU from an M-reg LSI to an L-reg ESI is generally not straightforward due to differences in engine management systems, security features, and coding. While some ECUs may be compatible, many modern ECUs require re-coding or synchronization with the vehicle's immobilizer system to function properly. Therefore, it is advisable to consult with a professional or dealership to determine compatibility and whether re-coding is necessary.