Map Sensor
your knock sensor could need to be replaced
LS does not have a knock sensor. GSR does have a knock sensor
the motor could pre-detonate or "knock" that can cause damage
Do you mean the knock sensor? It's a device that detects engine knock so that the computer can retard the timing. If the knock sensor isn't functioning, it could be a connector or the sensor.
The knock sensor detects spark knock or ping.
that the knock sensor does
Where is the knock sensor for a 99 pathfinder
Could be a bad knock sensor. The ECM may be retarding the timing based on bad input from a faulty knock sensor.
There are no symptoms since the knock sensor doesn't do anything unless the engine is detonating, in which case it would do nothing and you would hear it. The knock sensor code is often tripped when there is a fault in something else since it's part of the same circuit. This is considered a "ghost" error code.
If the knock sensor failed the CEL (Check Engine Light) would be illuminated and the engine may "ping" or "spark knock" under load. Serious "spark knock" can damage the engine if allowed to continue.
you mean knock sensor
I don't believe it has a knock sensor.