What does a malfunction indicator light on OBD2 mean?
What does a malfunction indicator light on OBD2 mean? This light, in the OBD2 standard language, is also called a malfunction indicator light (MIL). When that light is on it means there is a certain sensor in the car that has sent an error message to the powertrain control module (PCM) which it can’t decode. What do I need to do OBD diagnostics? There are basically 3 things you need to record diagnostic data and clear diagnostic trouble codes ( DTC's ) and turn off the check engine light from an OBDII based system on your 1996 and newer car....