Oxygen Sensor Some vehicles have (2) and some have (4) O2 sensors.
When you start looking at the O2 sensors, they are normally numbered something like "Bank 1 Sensor 1" Bank 1 is on the passenger side; Bank 2 is on the driver's side. Sensor 1 is the upstream sensor (near the frame, between the block and the cat) and Sensor 2 is near the Y-pipe (downstream of the cat).
Normally it is the upstream sensors (sensor 1) that go first. They see the harshest conditions. You will need; Oxygen Sensor Socket Anti-Seized Penetrating Oil I have even used a small plumbers propane tank and heat it up and it help get them free. Sometimes it will take 15 minutes or take a few hours it depends on your luck...
The knock sensor on a 2001 Nissan Sentra is located on top of the engine, near the exhaust manifold. It detects abnormalities in the ignition and combustion cycle.
If your security sensor in your 2001 Nissan Sentra 2.0 is jarred or jammed you should have it replaced.
problem with fuel filterhow do i change the fuel filter on my 2001 Nissan sentra gxe, and where is it located?
Located in the air tube, left front of the engine compartment, just before the air cleaner box. Two wire sensor.
Where is a crankshaft sensor located on a nissan almera 2001
posibly
The 2001 Nissan Sentra has 16 valves.
Replace the Downstream O2 sensor (after the catalytic converter)
The 2001 Nissan Sentra is a gas-powered vehicle.
The 2001 Nissan Sentra has an inline 4 engine.
The 2001 Nissan Sentra has a 5-speed manual.
The height of the 2001 Nissan Sentra is 4 ft. 7.5 in. (55.5 in.).