Question What Causes P0304 in the Hyundai Sonata? Answer Cylinder 4 Misfire Detected More Info 1. Spark Plugs/Ignition Coil: Worn or faulty spark plugs or ignition coils in cylinder 4. 2. Fuel Injector: A clogged or malfunctioning fuel injector. 3. Compression Issues: Problems with cylinder compression due to leaks, damaged valves, or worn piston rings. … Read more

P0011 is a trouble code that can appear in Hyundai Sonata vehicles, triggered by the vehicle’s on-board diagnostic system (OBD-II). This specific diagnostic trouble code (DTC) indicates an issue with the Variable Valve Timing (VVT) system. Let’s take a closer look at this code and the steps to resolve it. P0011 Hyundai Sonata: Diagnostic Table … Read more