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I have 2004, and no problem with electrical or any kind, but suddenly, my left turn signal star blink fast and my speedometer has half of the number. Any clue?? anyone pass thru the same nightmare?

So, here it goes. 1.) On my odometer, if i longpress the reset buton, the time changes to the temperature of the intake air. My issue is that this always shows 12c, no mather if its hot like hell, or cold like in Siberia, this value does not change. Is there a way i can test if the...