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Malfunction Indicator Light

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There are conditions that may trigger a fault code in the system, causing the control module to store the code. Depending on the particular fault that occurred and whether it is continually detected, the fault code may set the ‘Check Engine Light’ (CEL) or ‘Malfunction Indicator Light’ (MIL) on the dash. This signals the driver of a persistent fault in the system but often does not stop the vehicle from running. In fact, the MIL may be on but the vehicle may be running normally.