Quote Originally Posted by Kaiser
Not to argue with the man, but there are some vehicles who throw non-emissions related MIL's. I have seen few (Out of several hundred) cars come through the shop with their MIL light active that passed an OBD code read test because the OBD code was not emissions related, and just having a MIL light on will not force-fail you. As long as the MIL light is on, and the ECU is telling it to be on, and the OBD codes are not emission related, then you can pass.

To that end, everything else TM4.0 said is dead on accurate.
true....SOMETIMES...VERY VERY rare for a car to pass. I think i've seen it once out of 500 cars. but thanks, +10