​Malfunction Indicator Light (MIL)

The Bulb Check: ​​​​​​​​Malfunction Indicator Light (MIL)

​​​​​​​​​Indicates the engine computer has set a Diagnostic Trouble Code (DTC). This indicator light in much the same as your Check Engine Light. Some older cars use this indicator but it is usually the same. All it is telling you is that the self diagnostic part of the computer or a sensor somewhere on the drivetrain has set off a code.

​​What to Do: ​​​​​​​​Malfunction Indicator Light (MIL)

​​​​​​Usually requires diagnosis with a professional scan tool. You can purchase one, take it to an automotive shop or stop at a local parts store as they can read the codes and tell you what the issue is. 

​As long as the vehicle seems to be running fine, no other indicator lights are on or any of the gauges are reading abnormal, you should be able to continue to drive the vehicle until you can get the code read. A scanner is connected to a port called an ODBII which is normally under the dash on most vehicles. 

​However if the vehicle is running poorly, the engines seems to be missing or sputtering or you might smell something that doesn't seem right, you may want to park the vehicle and have it taken to a shop. ​

​Top ​6 Reasons To Set Off Malfunction Indicator Light (MIL) And The Check Engine Light:

  • ​Your Oxygen (O2) Sensor needs to be replaced
  • ​Gas cap is loose, damaged or missing
  • ​You have a bad catalytic converter
  • ​It's time to replace your Mass Airflow Sensor (MAF)
  • ​Ignition System Failure such as spark plug, spark plug wire, coil pack, distributor cap or rotor button
  • ​Cam Sensor
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