Do you need a dealer to prograre your replacement ecu?

In most cases, you do not necessarily need a dealer to program a replacement ECU, as many aftermarket tools and devices can perform the programming. However, some vehicles may require specialized software or hardware that is only available at a dealership. Additionally, programming an ECU often involves ensuring compatibility with the vehicle's security systems, which can be more easily accomplished by a dealer. It's advisable to consult with a professional or technician familiar with your specific vehicle model for the best approach.