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ABS Fault Code List 1991 Corvette (C4) Code Definition 21 Right Front Wheel Speed Sensor Fault 22 Right Front Toothed Wheel Frequency Error 25 Left Front Wheel Speed Sensor Fault 26 Left Front Toothed Wheel Frequency Error 31 Right Rear Wheel Speed Sensor Fault 32 Right Rear Toothed Wheel Frequency Error 35 Left Rear Wheel Speed Sensor Fault 36 Left Rear Toothed Wheel Frequency Error 41 Right Front Solenoid Valve Fault 45 Left Front Solenoid Valve Fault 55 Rear Wheels Solenoid Valve Fault 61 Pump Motor or Motor Relay Fault 63 Solenoid Valve Relay Fault 71 Electronic Brake Control Module Fault 72 Serial Data Line Fault 75 Lateral Accelerometer Fault (Short ot Open) 76 Lateral Accelerometer Fault (Signal out of Range)
Component Y3/6N3 speed sensor 3 is faulty,That is a transmission code...the trans speed sensors are MADE into a printed circuit board that connects to the valve body...MB part number is 140-270-08-61.. LIST price in the USA is $225. TAKES about 1.5-2 hrs to install