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A car engine needs spark, fuel, and compression to start. In order to find the problem; it is necessary to see which of those things is absent at the time the car refuses to start. It probably is an ignition system problem. If the car has gone more than 25,000 miles on the spark plugs which are in it; I would definitely change the plugs; making sure the new plugs are the proper type for this engine, and that the gap is set to manufacturer's specifications. (The 4 and 6 cylinder Sonatas each use a different type of spark plug). But in order to not take any chances; I'd also replace the fuel filter at the same time.
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