A.B.S. BRAKE LITE ON CODE 34 AND 79. CODE 34 LEFT REAR WHEEL SPEED SENSOR CODE 79??? NOTHING IN SNAP ON SCANNER OR ALLDATA. SO WE CHECK OUT THE WHEEL SPEED SENSOR OHMS OPEN NO A/C VOLTS NO PATTERN. REPLACE WHEEL SPEED SENSOR STILL HAS CODE 34 &79. TEST DRIVE T... Login to read more.