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The P0303 OBD trouble code indicates a misfire detected in cylinder number three of the engine. This can be caused by issues such as faulty spark plugs, ignition coils, fuel injectors, or even engine compression problems. To repair it, start by inspecting and possibly replacing the spark plug and ignition coil for cylinder three, then check the fuel injector and ensure there are no vacuum leaks. If those components are functioning properly, further diagnostics may be needed to assess engine compression or other underlying issues.
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Trouble code P0303 means:Cylinder 3 misfire detected
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Codes P0422 P0343P0303 mean 2002 Kia Sportage?
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Cylinder number 3 misfire.
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# 3 cylinder misfire.
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