What does it mean when codes are stored but check engine light not on
If an error occurs in the EFI system the ECU stores error codes in the ECU memory and turns on the check engine light. But does anyone know what it means if error codes are stored in the ECU memory but the check enigne light doesnt come on. Does it means the codes are old, stored earlier but no longer valid or does it mean the error is not qualified enough to turn the check engine light on. Or what does it mean?