Does a bad knock sensor stop the car while driving?

No, a bad knock sensor will not stop the car while driving. However, it may cause the engine to run poorly and inefficiently. The knock sensor is used to detect engine knocking, which can be caused by a number of factors, including low octane fuel, engine damage, or spark knock. When the knock sensor detects knocking, it sends a signal to the engine computer, which then adjusts the engine timing or fuel mixture to reduce knocking. If the knock sensor is bad, the engine computer will not be able to detect knocking and will not be able to make the necessary adjustments. This can lead to engine damage and poor performance.