Chevrolet Prism P0303 OBD2 Code: Cylinder 3 Misfire Diagnosis

I'm experiencing a Check Engine Light on my Chevrolet Prism, and the diagnostic code displayed is P0303. This code indicates a misfire in cylinder 3 of the engine. A misfire in this cylinder can lead to reduced fuel efficiency, rough idling, and potential damage to the catalytic converter if not addressed promptly. The issue may stem from problems such as faulty spark plugs, worn ignition coils, clogged fuel injectors, or issues with the oxygen sensor. I've confirmed the code using an OBD2 scanner, and it consistently appears when the engine is under load or during startup. For accurate troubleshooting, I recommend inspecting the spark plug in cylinder 3, checking for proper spark plug gap, and ensuring the ignition coil is functioning correctly.