94 Suburban Service Engine Soon (Page 2/2) Phirewire JAN 10, 03:34 PM It is as followed: This is what it did: (Flash pause flash flash) Code 12 1 flash, pause 3 flash. (Flash pause flash flash flash) 3 flashes, pause 5 flashes. (Flash flash flash pause flash flash flash flash flash) 4 flashes, pause 3 flashes. (flash flash flash flash pause flash flash flash) If someone could tell me what code that is and What it stands for that would be awesome jaskispyder JAN 10, 05:00 PM quote Originally posted by Phirewire: It is as followed: This is what it did: (Flash pause flash flash) Code 12 1 flash, pause 3 flash. (Flash pause flash flash flash) 3 flashes, pause 5 flashes. (Flash flash flash pause flash flash flash flash flash) 4 flashes, pause 3 flashes. (flash flash flash flash pause flash flash flash) If someone could tell me what code that is and What it stands for that would be awesome 13. Oxygen sensor 35. Idle air control. 43. ESC - electronic spark control. Knock sensor not sending signal to ESC. 1988holleyformula JAN 10, 05:52 PM quote Originally posted by jaskispyder: 13. Oxygen sensor quote Originally posted by 1988holleyformula: My money is on o2 sensor.