My 2001 nissan sentra gxe gave a code p0720. what can I do?

remove 2 bolts on transmission holding the mount and 2 bolts on frame holding the mount. use a lever such as a 2x4 to take the weight off the mount. replace with a new mount

your ECM/ computer may be shot. those model sentras had campaign, where the ECM box would be lined with foam to hold the computer tight, but the fumes from the glue that Nissan used to hold the foam down, would eat the computer internally and destroy it. Nissan had us pull those foams out and discard. if you still have the foams inthere, good chances are that the ECM is fried, causing issues. Question: did you use aftermarket air filter in the air box?? or Nissan filter?? Let me know. very important to use Nissan filter it this car.

It sounds like the transmission is slipping and the sensor is just reporting this info and setting a code, you have made a common mistake. You likely need a transmission overhaul

this problem is caused by a defective fual gauge sending unit inside the gas tank.

you have a short in your dash lights try replacing it.

Take a few minutes to make sure you dont have a blown fuse....Run through them with your test light...

it is wher the engine meets the transmission..on the flywheel...and the oxygen sensors bank 1 is the one before the catalyst....and bank 2 is the one after the catalyst....

Distributer Signal Output is code p1320........Intake Valve Timing Control Position Sensor Bank1 is code p1140...

You will need a new catalytic convertor assembly. Yours is below treshold efficiency in other words its "no good".If you have it replaced, ask the garage/dealer to give you the old one back. Its worth some cash if its full. It doesn't matter thet it failed. They are going after the mesh inside of it and that is worth some $$$$. May not be much , but better than nothing.

Code P400 is an EGR (exhaust gas recirculation) valve malfunction.

These cars are known for the EGR ports getting clogged.

The valves themselves rarely fail.