A common cause of vibration at speed is unbalanced tires. Maybe you want to look into that and also check on the car wheel alignment if the steering does not stay on a straight path on a level road. one possible answer is the belts in the tires may have slipped. check with tire specialist to be sure. Ask them to check all 4 tires because one slipped belt will cause problems. I drove my car with this problem for almost a year before I got the right answer. replaced all 4 tires and now it drives nice and smooth.
Check your rear wheel bearings.
The brake light switch is located above the brake pedal on a 1993 Nissan Sentra. To reach the switch the driver's door needs to be opened.
The starter motor on a 2001 Sentra SE 2.0L is at the back of the engine bolted to the transmission just above the driveshaft.
Its under the back seat and sits in a cylinder above he gas tank
it's above the gas pedal under the column. it's way up there where you can hardly get to it. it has two, maybe three, large plugs on it depending upon the exact model of Sentra. Hope that helps.
In the center dash console, beneath the middle A/C Vents, besides the Rear Window Defogger and above the A/C Control Panel.
Its just above the right inner CV joint, plugged into the bottom/ back side of the engine block. You can only get to it from under the car.
You need to replace air flow meter for your Sentra. Make sure the air filter is clean! an engine needs air to burn the fuel!
The car may not turn over if it is close to overheating. Check the coolant reservoir to make sure that it is full and not leaking.
I have a 1.6 L motor, it was; torque to 21, then torque to between 51 and 54 lbs. completely loosen bolts then repeat tightening pattern above.
jet stream
The crank sensor is located on the firewall side of the engine block just above the oil pan toward the back by the transmission. There's a bracket in front of it that hides it slightly. its held in with a 10 mm size bolt head.