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- ?Lv 67 years agoFavorite Answer
It's really the Intake Air Temperature sensor (IAT) It's used by the the computer to calculate proper fuel pulse.
- Country BoyLv 77 years ago
It's called the ambient temperature sensor. If the outside temperature is displayed on your dash it does not need to be replaced. The above non-mechanic doesn't have a clue.
- Anonymous7 years ago
this is to tell you the air filter needs to be changed
Source(s): service & repair 30 years
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