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I just bought my 2002 suzuki gsx-r 750 from a dealer. it has a yoshi cf tri oval exhaust on it and the red FI light is on. The dealer told me that was because the computer was never reset when the exhaust was put on. I just followed Skibum91's instructions and found out the code was C21, which means it is the intake air temperature sensor (IATS). What do i hafta do to turn this light off.
 

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Either it is unplugged..... which is possible, or it is a bad sensor, in which case you need to get a new one.
 
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