The Nissan gurus put the knock sensor on the car for a reason. Unfortunately it uses the engine block for the ground and only one wire of the two in the harness is live. The knock sensor is not the easiest piece of equipment to get to so many people either live with the knock sensor being bad or bypass it. Once you get to the sensor, you can clean the engine block and the bottom of the sensor and reinstall. That cures the problem in many cases. The most effective safe way to fix the knock sensor is to replace it. If you want to take your chances you can research knock sensor bypass in your favorite search engine. There are a lot of articles with step by step directions so I doubt the procedure needs to be repeated here.
You should not bypass the relay. Repair the problem.
If your security sensor in your 2001 Nissan Sentra 2.0 is jarred or jammed you should have it replaced.
Its In The Boot Of The Car And Should Be On The Side
it should be in the distrubator
you probably have a leaking heater core....you can replace it or bypass it
YES it does. It should be close to intake.
It is definitely not a good idea to bypass the sensor. If you have the 22re engine, then replacing the sensor or the wiring is trivial. Not so on the 3vze. The sensor is located under the upper and lower intake. So, for a quick bypass you can buy a new sensor and attach it to one of the engine mounts (there should be one on the drivers side, a couple of inches from the wiring harness). You can either drill through the mount, or bolt the sensor inside the loop of the hook. Note, this is a very temporary "fix". In this location, the sensor will not be able to perform its job. Be warned!
You should never by pass any safety sensors on your lawn mower. BUT :for testing your brake sensor you can try taking the wires off the switch that is hooked ether at the back of the peddle or on the linkage and join them together .That should bypass it until you get a new switch.
no, it would be a problem if you had the supercharged engine in which case you should change it right away. if you have a non supercharged engine do not worry about as it will not affect you. unless you need to pass an emission test.
Once all the tires are inflated to the specified pressure the sensor light should go out after a few miles.
did the heater core start leaking? anyway you should have no problem with the air if you bypass the heater core.
The connector should be by floor next to buckle