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).. dealer code c21. Jump to Latest. A forum community dedicated to the Suzuki GSX-R motorcycle. Discuss the GSX-R600, GSX-R750, GSX-R1000, and GSX-R1100, and more! Show Less . Full Forum Listing. Explore Our Forums. General Bike Talk 06-07 GSX-R600/750 GSX-R1000 General Forum Photos & Videos The Original Farm.

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2006 GSX-R750 Red/Black - Akrapovic Shorty Slip-on, fender elimintator, Motovation: Swing arm, Frame, Front fork sliders. Stomp Grips. Motovation bar ends, Puig windscreen, Progrip 724, Corbin front seat, Pazzo Short levers, !SET, -1 Driven front sprocket, A&R 6000k HID, R1 Throttle tube.. GSXR ECU Fault codes. c00 c11 c12 c13 c14 c15 c21 c22 c23: c24, c25, c26, c27 c28 c29 c31 c32, c33, c34, c35 c41 c42 c46 . MALFUNCTION CODE: DETECTED ITEM: DETECTED FAILURE CONDITION:. c21: Intake air temp. sensor malfunction: The sensor voltage should be the following. (0.15 V < or = sensor voltage < 4.85 V) Without the above range, c21 is.