I recommend that you bring your car to a Mazda dealer and get the CEL checked out.I don't know if anyone else has experienced this, but every time it gets cold here in Denver I get a CEL. What in the world is going on? Anyone else experience this at all? Any idea on what it might be?
The swirl shatter valve is used to change the intake air flow when the engine is cold to improve emission performance. You can find more information at Mazda6TechWhat is the swirl shatter valve? I just noticed on the drive in today that my car has some kind of rattle noise when the fan is on (turned to floor). Hard to hear but I can hear it.