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these are designed to be placed were they are so it will only pick up a knock from the engine and not other things bolted to the engine. just replace the knock sensor were it was designed to work best.
They are located below the intake manifold, you may have to remove the intake to change them. The sensors may be shot, they have a problem with water puddling in their mounting wells, after changing, seal the sensors with an RTV to keep water out of the wells
The Knock Sensor (KS) system detects engine pre-detonation. The Powertrain Control Module (PCM) retards the spark timing based on the signals from the knock sensors. The knock sensors produce an AC voltage when specific frequencies are detected. The knock sensor voltages are an input to the PCM. The amount of AC voltage produced is proportional to the intensity of the knock.
When you ****** timing fuel mileage goes down.
knock sensor is located on the block usually under the intake. nissan has problems with these sensors. i have chaunged plenty of these on nissans in the past year. this has no affect on your gas mileage. this sensor picks up misfires on the engine. sometimes you might have rough idle and can't feel it in the drivers seat but the knock sensor can. i would suggest maybe a tune up spark plugs, air filter, fuel filter first before going to take apart a bunch of things to change a sensor. the sensor is designed to pick up any differences in motor quality and will throw the engine light on. sometimes the problem is the knock sensor, or there is an underlying cause that the knock sensor is reading.
The knock sensor is easily replaced. If you look below the passenger side exhaust manifold, you should see it sticking out of the side of the engine block. it'll have an electrical connector, that once unplugged, will allow you to unscrew the sensor from the engine block. I hope this helps.