If you reset the car computer following the car battery replacement, you may confirm that replacement items for the vehicle you make are entirely required in order to clear the engine light. One of the most popular techniques to reset a car computer is to reset an ECM (Electronic Check Module). The process to Reset the Car Computer After a Car Battery Replacement One approach is to disconnect the battery cable for 2 to 3 minutes, then reconnect it and start the car to see whether the check engine light illuminates again. Drive the car for at least 10 miles to alert the ECU to a problem; if one exists, the check engine light will illuminate again, and you can examine the ECM's error code. These codes will direct you to the source of the problem, allowing you to start eliminating parts in order to resolve it. After the new parts have been installed, you can proceed to reset your computer so the engine control can "read" new parts and save the new data. Before restarting the ECU, make sure you have a backup power supply in excellent working order for battery wiring. The reset of your ECU cars should not be as concerned as there are other possibilities, such as a reset via the fuse box. The two most popular techniques to reset your car computer are unplugging or resetting the fuse associated with the engine control module. It is also an excellent option to reset the ECU to make the engine adjustments. In this circumstance, you will have to reset the engine control modules manually through the fuse box. On the passenger side is a fuse box beside the battery. Turn off the vehicle and unplug the fuses once fully heated, and then unplug the batteries to power off. After a few minutes, all of the old data should be reset, then reconnect the fuses and reboot your engine. Allow your vehicle's ECM at least 10 minutes to "read" any new alterations you have made. Because the auto ECU is such a sensitive module, it must be reset following any modification otherwise the new adjustments can interfere with prior operations of the engine.