Were is the knock sensor on a 01 sentra 2 0 - 2001 Nissan Sentra

Sounds like the timing has jumped a tooth or two. Be careful running the engine since the valves can be bent beyond repair.

Melvia, Knock sensor located under the intake manifold between cylinder #2-3 I believe, hard to change with out removing intake manifold, but can be done. Check the attached links,instruction and guides, Good luck
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No a knock sensor can not make a misfire. Check the coils, plugs and fuel pressure .The random misfires are cause the knock sensor to throw the code.

A knock sensor tells the engine computer when one or more of your engine's cylinders are "knocking", that is, exploding the air/fuel mixture in a way that delivers less power and can be damaging to the engine if prolonged.

The transmission has been electronically controlled for several years.
The miss could cause the knock sensor to set a code, but the sensor will not cause the miss. The knock sensor signals the computer and the computer tries to cut back on ignition timing to stop the knock. The sensor can set a code if it is a spark knock or something mechanical.

• Knock sensors measure engine vibration caused by pre-ignition
• When not replaced, vehicle may experience engine ping or knock, high emissions, poor fuel economy, internal engine damage and/or CEL/MIL illumination

Hi, you have provided trouble codes p0100 AND p1605.

Trouble Code: P0100


Mass Airflow Sensor Circuit Malfunction
Possible Causes:



Air Intake leaks located after the MAF sensor assembly MAF sensor signal circuit is open, shorted to ground or power MAF sensor has failed PCM has failed

Trouble Code: P1605

A/T Diagnosis Communication Line Malfunction

Possible Causes:


TCM communication line circuit is open or shorted to ground TCM communication line circuit shorted to VREF or power (B+) TCM or PCM has failed TSB 01-004 (01/01) contains information related to this code
For the P0100, check the connector on top of the MAF sesnor for looseness or corrosion. Connector is on top in piocture below.

if you are talking about a pinging upon acceleration then we are talking about a knock sensor and chances are you have a check engine light on. verify the code and replace the knock sensor.

The knock sensor is located under the intake manifold.The best way to get to it is to lift the car completly up go undert it and look right under the intake manifold.There is a steel tube about 2inches thick that will be blocking your view but its right behind it.GOOD LUCK.

bank 1 sensor 1 will be in exhaust manifold by firewall in the middle. bank 1 sensor 2 will be behind convertor .bank 2 sensor 1 will be in the front manifold down at the end of it