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Wells Vehicle Electronics ignition coils produce the high voltage necessary to ignite the air/fuel mixture in the combustion chamber. When the ignition coil is not replaced, your vehicle could experience any of the following: No or hard start, long crank time, misfire, lack of power, inconsistent transmission shift points, spark plug fouling, catalytic converter failure, poor fuel economy, or Check Engine Light (CEL) illumination. Wells Vehicle Electronics coils are designed to meet or exceed Original Equipment (OE) specifications in form, fit and function, operating dependably and reliably under all operating conditions and throughout the entire engine speed range for peak engine performance. The coil-on-plug design reduces energy loss by placing the coil output as close as possible to the spark plug; some incorporate a control module and ignition coil for each spark plug. Every component either matches or improves on the OE design to ensure fast, easy installation, superior performance and reliability.