Do you need a knock sensor on 94 4runner v6 3.0 efi?

Yes, the 1994 Toyota 4Runner with a V6 3.0 EFI engine requires a knock sensor. The knock sensor detects engine vibrations caused by knocking or pre-ignition, allowing the engine control unit to adjust the ignition timing for optimal performance and to prevent engine damage. If the knock sensor fails, it can lead to reduced performance and increased emissions.