Originally Posted by
LSVTECEG757
Yea knock sensors do go bad. If its a gsr it should be under the intake mani in the rear of the motor. Under where it curls. I know you do have to wire vtec yes,but I THINK you also have to ground the knock sensor or use the gsr harness. If you just ground it you shouldn't get a cel.
Knock sensors are your friend. If you have provisions for mounting a knock sensor to the engine (like DOHC VTEC blocks) and an ECU with a knock sensor board in it, you'd be a fool to ground the input rather than using a functional knock sensor.