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The Ignition Coil in vehicles specifically Chevrolet Cobalt automobiles is responsible for transforming the battery energy of 12 volts into the high voltage energy 15000- 40000 volts needed to ignite the air-fuel blend inside the engine cylinders. The purpose of this component is to provide the connection between the main and secondary circuit of the ignition system here two coils of insulated copper wire are wound up on an iron core to get the necessary voltage. Cobalt models have had use different types of ignition coils over the years these include distributorsystems, distributor-less ignition systems (DIS), coil-on-plug (COP) and coil-near-plug(CNP). The main difference among these types of systems is the approach and structure; for example, in DIS systems, 2 cylinders can possess numerous coils, whereas COP systems possess a single coil for every spark plug, increasing competency and minimizing the utilization of high-tension leads. A fault in ignition coil is characterized by engine rough running, low performance and warning lights on necessitating diagnosis and repair.