The resistance range of a knock sensor varies depending on its type and condition. High-quality sensors should generally have an approximate resistance reading of 0-10. (Ohms). Any readings outside this range may indicate that the sensor must be replaced. As always, consult your vehicle's service manual for specific instructions on testing and troubleshooting your specific make and model. Furthermore, if there are discrepancies between the service manual and the results you are seeing, you should seek the assistance of a qualified technician.