Knock Sensor 1995 ZR1

[WMATA ZR1]

Hi anyone here that can offer me help or suggestion

1995 ZR1 not sure when it happen my wire clip broke wire fell and burn on my header pipes causing my service soon lite to come on. I do not have a tech 1 scanner so I used a jumper. I forget the code number by came up knock sensor. I purchase a new knock sensor and sensor wire. I cut out the burn wire replace with new wire and sensor. I cleared the code getting C12. After starting the car the same knock senor code would reappear in about 15 second. I then purchase a AC DELCO senor with wire installing and clearing code. Start the car and getting the same code just after starting. any suggestion will be great
I,m in the Wash DC area If know of a good ZR1 shop in this area let me know