You may have a bad output sensor or the wires are loose on it. the output sensor is located behind the air mixture box. to remove it you will need a 10MM wrench and about 30 minutes.
You might check the wiring of your speakers and check if they are working then check your CD player if its working properly.
I had the same problem with a Hyundai Accent 1996. You need to disconnect the speedometer inside the front hood.
You need to disconnect the cable from the transaxel. Then you pull out your dash cluster. Remove clip from speedometer cable then just pull it out. Reverse for installation.
Hyundai Accent was created in 1994.
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The 2005 Hyundai Accent has 16 valves.
The 2014 Hyundai Accent has 16 valves.
The 2006 Hyundai Accent has 16 valves.