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but thats sayin that either can show u there is something wrong, either the ecu LED and or the check engine light. that does not speciy whether or not the check engine light has to be on for the ecu to have codes, which i dont think it does and other people have agreed with me it doesnt. i am tryin to clarify that even though the check engine light is not on, that the ecu can still have codes meaning something is wrong.
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