The role of the engine control unit (ECU) is to optimize the engine's overall performance. It does this in many ways, which includes controlling the air-fuel ratio, the idle speed, the variable valve timing, and the electronic valve. The result is optimum or improved all-around performance of your vehicle when the ECU is working to its fullest potential. If you need a replacement engine control unit for your vehicle, or are maybe looking to modify your engine to allow for upgrade or aftermarket components, then look no further! BE FORWARD carries ECU parts for a wide range of major auto manufacturers, including Toyota, Nissan, Mitsubishi, Honda and Subaru. Best of all, you can find these ECU parts at a great, low price. If your ECU unit is damaged, there's no need to give up on your entire vehicle. Check out the BE FORWARD auto parts stock and get your car back to 100% functionality quickly!