Knock sensor

i own a 94' and iam gettin a error code 3,4 which means Knock sensor ?

anyone has any info about this sensor?

I don't have any info about that particular sensor but have you advanced your timing? Have you checked your timing to make sure it's correct? If you're running advanced timing and are not using premium fuel, your engine will "knock". This could be what's tripping the sensor.

Or, it could just be that your car is getting older and the sensor is going out. <shrug>