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The Spark Plug of Toyota Corolla vehicles is responsible for igniting the blend of fuel and air inside the cylinders of a vehicle's engine to cause combustion to happen. A depreciated spark plug presented symptoms to catalytic converters and likewise generate starting system problems. A spark plug has a metal shell, central electrode, ceramic insulator and a side electrode which form a gap to ignite the combustion. Design variations include numerous ground electrodes and surface discharge plugs to enhance the processes of ignition and product durability; in this case, the gap and heat range should be optimal in order to provide maximum work and to safeguard the engine. Spark plug reading and indexing are used to perform a condition of an engine and exposure of a fuel mixture to the spark, respectively.