The ECM is another term for the ECU but is often used interchangeably. It focuses specifically on controlling the 2009 Saab 9-7X 4.2L Engine Computer's operation, including fuel injection, ignition timing, and emissions control to ensure proper functioning and efficiency. Extensive Inventory Flagship One, Inc offers a wide range of refurbished and pre-programmed control modules for various vehicle makes and models. Their extensive inventory ensures you will find the right module for your sp...