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Discussion Starter · #1 ·
Okay, how critical is the IAT sensor. I unplugged mine on my 99 STS while I had the intake tube off and forgot to plug it back in. I went on a 60 mile drive and didn't realize it was unplugged until the next day. It didn't throw any codes which surprised me.

What exactly does it do and how can I tell if it is working properly? I assume the sensor is OK, but why no codes when it was unplugged?
 

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2010 DTS
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It measures the Intake Air Tempurature and relays it to the PCM so it knows how rich the fuel mixture needs to be. It should throw a code if it is unplugged. I am sure you can test it by taking a resistance reading but without a manual infront of me I don't know what it should be. I am sure it will vary with tempurature. As to why it didn't throw a code, I am unsure.
 
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