Every time you turn the key in the ignition, several computers communicate to all the engine systems to control their operation. As you begin to drive, all these computers work together to perform precise adjustments on how your vehicle is responding to different factors, like the speed you are driving, how much air and fuel to mix together, the engine temperature and more. When something isn’t running quite right and your vehicle starts to emit more pollutants, the on-board diagnostic (OBD II) system sends a signal that triggers the Check Engine or Service Engine Soon light. If this light is on, there is a problem with engine performance.
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