Spark Plug Function of Spark PlugSpark plugs are responsible for delivering a charge to start the engine and to accelerate the car.When is it time to change my Spark Plug?Car does not start efficientlyIncreased fuel consumptionLack of accelerationGenuine Toyota Spark PlugCenter electrodes are made of heat-conducting copper, allowing them to cool or heat up quickly as neededHigh quality build materials allow a greater heat range, preventing meltdownSElectrodes can handle high-speed driving efficiently Fake/Counterfeit ProductSingle layered elements clog easilyMay deform and wear out quicklyPoor quality which may shrink due to heat and can cause engine damage