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Discussion Starter #1
Does anyone know????

Is it possible to get an error code out of the ECU , even if the check engine light didn't come on? OR do all malfuntions that result in an error code also illuminate the light?
 
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If a code is set the light typically comes on, however if the system does not detect a fault on subsequent checks, it can turn the light out but keep a code in history. After so many times of no trouble found, it will purge history as well. Codes can set and not illuminate the MIL (malfunction indicator light) depending on the malfunction severity. Basically it is a soft code. The repair manual lists whether the light is turned on or not for a given code.
 
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