Where is the coolant sensor located on a nissan sentra 2001 1.8 engin

You need a scanner to see the function of each of the sensors and findout which is the one you need to change. nissan sentra has 2 upstream sensors and 2 downstream sensors. some scaners identify the sensors with a letter A OR B

heat sensor usually located close to the thermostat housing, link below should be similar to yours
How To Install Replace Coolant Temperature Sensor 2 5L Nissan Altima Sentra
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what engine????
i think that should be qg15de

Possibly the intake air temperature sensor or the engine coolant temp sensor are stuck at full hot. The computer will schedule too little fuel--especially with the engine cold and you'll have very little power until the engine actually gets closer in temp to the stuck sensor. The engine coolant temp sensor sends signals to the computer NOT to your temperature gauge on the instrument panel. That is a different sender. So your coolant temp gauge on the instrument panel may show normal.

Engine coolant temp sensor should be on the drivers side of the engine block. Follow your top radiator hose from the radiator to the engine block. near that you should see a sensor (it has a clip on it where the wires attach).

Vehicle Speed Sensor is IN the Transaxle-is your ecu indicating VSS circuit is open? Check out Nissan Forums.com If so, most likely, the sensor is bad or unplugged.Circuit includes sensor,wiring from sensor to the ecu,and the ecu itself.

It is located at the back of the head in the coolant passage that the lower hose connects to.

Follow your plug wires to coil pack and module. Once you found the module, follow the wires from there to crank sensor on engine block.

Chances are it is not the coolant temp sensor. The sensor is located right above the alternator, if you have the smaller engine. I wouldn't touch the sensor if you don't have a check engine light on.

remove the throttle body.use a carburetor cleaner.clean also the stepper motor located beside the throttle body.at your car's mileage,probably its clogged with dirt.try it first before replacing the maf sensor.