MY CAR HAS THESE CODES P0325 KNOCK SENSOR 1 CIRCUIT MALFUNCTION (BANK 1 OR SINGLE SENSOR) AND P0303 CYLINDER 3 MISFIRE DETECTED..
PLEASE HELP.. I DONT HAVE ANY IDEA WERE THE KNOCK SENSOR IS LOCATED. :banghead:

I Have A Code P1320 ( Manufacturer Controlled Ignition System Or Misfire ) On My Nissan And Wont Start. What Is Next Step So I Can Get My Car Running Again. Please Get Me Out Of This Mess... Help Please ...h
Elp... Thanks

My 97 Altima just started the same issue last night on the way home...The Knock Sensor is supposed to be just above the oil filter on the back side of the engine. Hopefully someone with more knowledge can tell us if the problem is with the sensor, or may be another issue causing this.

CODES P0325 KNOCK SENSOR & P0303 CYLINDER 3 MISFIRE

The knock sensor code was probably generated due to the cyl misfire. Check spark plug galley for any oil leaking from valve cover, saturating plug wire. If dry check plugs, replace as needed with wires. If misfire is still present injector pulse and compression check would be the next step.

The Knock sensor is above the oil filter under the intake, right under the coolant pipe. Free free to ask any more questions you may have.

i have replaced several of those knock sensors in the past and its takes care of the problem