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In a 2005 Hyundai Elantra, you can locate the OBD II port above the pedals in the driver's footwell area. This is where you will need to attach an OBD II scan tool to access and read the stored codes in the ECU. The OBD II port is a standard feature on all vehicles manufactured after 1996, serving as a diagnostic interface that allows you to communicate with the ECU. Emissions testing centers in the United States often utilize the OBD II port to verify that your vehicle does not have excessive emissions, which may become evident through an OBD II system test.
The OBD port in a 2005 Hyundai Elantra can be found above the foot pedals inside your car.