I hear a knocking noise coming from the engine
This is hard to say with hearing the noise but try to pin point the noise , is it coming from the top or bottom of the motor , the knocking noise could be a bearing in the lower motor or may be something else making it sound like a bearing,
SOURCE: where is the knock sensor located in a 2000 nissan
For Maxima, the Knock Sensor ( KS )is installed in the top, center
of the engine block. Access can be gained by removing the intake
manifold.
Hope this help to solve it (remember rated this help).
SOURCE: 2004 Nissan Quest - Engine chatter/knocking
Ther e is a chance your injectors are leakin g down and there is excess fuel in the cylinders. Not a good thing. So, you fuel pressure and injectors need chkg. good luck
SOURCE: 2004 nissan maxima
I have the same issue with my 2004 maxima.The service techs said it was the timing chain tensioners .Since they are hydaulic and they powered by the oil in the car .It is recommended to purge the the engine every time the noise starts to come back. I brought some an it really freaking work because I started to run it into a tree and go buy a toyota
SOURCE: Check Engine Light 1996 Nissan Maxima
The best way is to use a scan tool to clear the codes, that will turn off the light, also disconnecting the battery over night may work, but no completely sure about that, it varies from year to year.
SOURCE: 1996 Nissan Maxima 2.5 V6 Engine Knock sensor
The knock sensor is a major pain in the a..s to change I would suggest taking it to a reputable shop for a second opinion to see if they realy performed the work. Also with OBD11 (2) diagnostics if you have multiple misfires its not the wires its something else, also if you got a code for a misfire it would be specific as to which cylinder is misfiring. My best guess would be to get your coil checked.
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