Your vehicle runs with the help of numerous computers and sensors. In this high-tech network, sensors monitor everything from oxygen and air temperature levels to throttle positions, with the information then being relayed to the computers. These computers in turn process the information and take action, controlling other car components with the aim of ultimately optimizing your vehicle's performance. One of the most important computers is the engine control module (or engine control unit). This computer ensures maximum engine performance by adjusting actuators in your vehicle's internal combustion engine in response to the readings from sensors in the engine bay.

Often when there is a bad sensor, your "check engine" light will turn on. To accurately determine if the trigger is due to a faulty part or an issue with the sensors requires further investigation. The following are just some of the many issues related to sensors. When oxygen sensors, which are used to ensure a proper air-to-fuel ratio, become faulty, the fuel mixture might then run rich or lean and result in either excessive fuel expenditure and exhaust emissions, or a backfiring engine. Similarly, if a problem develops with the inlet air temperature sensor, the air-to-fuel ratio of the mixture can also be upset.

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