Automotive Troubleshooting for the Check Engine Light 1
Find the vehicle's OBD-II port. This port is on the driver's side, below the dash. Usually Auto diagnostic tools, the port is identified below the plastic dash console towards the left of the steering wheel. The OBD II port matches the shape from the OBD II reader's 16-pin cable connection.
2Connect the OBD-II reader, or scan tool, towards the OBD-II port. Turn the vehicle's ignition essential to the "Start" position, but do not turn the vehicle on. Access the OBD-II reader's menu to retrieve the diagnostic information. Before retrieving information Car Diagnostic Tools, many code readers require specifying in the menu the automotive brand connected for the scanner. Specific instructions vary according to device brand and model.3Allow the diagnostic reader to retrieve the diagnostic information from the vehicle's on-board computer. This may take several minutes. Codes display on the device when the process is complete.
4Interpret the code. Some readers display what each code means, while others only display a diagnostic code. Retrieve code interpretation with the OBD-II reader's user's manual or through the OBD-II website.5Repair the problem the code indicates. Clear the code on the device. You may also clear the verify engine light by removing the battery cable and pressing the brake and horn to remove all residual stored electricity in the on-board computer. Using this method to clear the verify engine light, however, will require the car's computer to relearn operating habits. If the problem causing the trigger is not cleared, the check engine light will return.
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