its an internal filter on top of the engine under the hood. its in a cylinder canister with a hard plastic top.
The transmission filter is located under the transmission on a 2002 Hyundai Sonata. it is under the transmission drain pan.
In THe Gas Tank
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Usually on the V6 Sonata's they are located under the hood. Look to the right of your engine and look down at the transmission itself. There should be a "spin on" filter, kind of like the one for your engine. if not then your filter is located inside the actual transmission.
The Hyundai Sonata's transmission range sensor is located directly below the vehicle's oil filter. It is located near the range switch.
under the fuel tank
It is inside the fuel tank.
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inside the tranny pan