After the frontal accident my altima 98 move R gear to parking .and lost first gear. can no take allway down to 1 gear

it should be a slot where the park handle at stick a key in the slot it should move the gears give it a try

Check the throttle positioning sensor and the transmission, it sound loke the sensor is givving bad information to the computer whis is cutting the engine when in gear, this might cause the transmission to break its syncro plate if it slamms in and out of gear.

This seems to be a common problem. Sometimes something like a pen or other items find their way to the shifter linkage and it can cause the linkage to bind preventing it going into park etc. Or you may have a bad shifter cable. Remove the housing around the shifter and see if anything did get in the way of the shifter. While the housing is of, move the selector up and down from park to drive. This will give you a better view of what is happening.

It sounds like the lever from the gear shifter has come loose. I would first look at the shifter from under the car. You can also remove the boot (or console) from inside the car and check the linlage. Most linkage is held on by a small clip or cotter pin and somethime they don't stay in place anad the linkage slides off the arm..

In the U.S. it is around 14 mph if you strike a fixed barrier and around 28 mph if you strike a parked car or similar object with a full frontal blow. Other types of accidents which are at an angle or not full frontal is determined by that particular manufacture and the year the car was made. The ECU will determine when to deploy the system in different types of scenarios.

I am having the same problem with my 05 Altima. For a temporary rememdy we took stuck a key down into the release hole in front of the gear shift. There may be a little cover over the hole, but if you take it off and stick something in it, it will release the shifter.

HELLO I HAD THIS SAME PROBLEM ON MY 95 NISSAN ALTIMA AND REMOVED THE PLASTIC COVER THAT AROUND THE SHIFTER AND THE SHIFTER BRACKET THAT MOVES TO PUT THE CAR IN GEAR THAT HOLDS THE SHIFTER CABLE IT WAS RUSTED SO I SPRAYED IT WITH WD40 A FEW TIMES AND MOVED THE SHIFTER BACK AND FORTH A FEW TIMES AND IT WAS FIXED NOW THERE HAS BEEN CARS THAT I HAVE WORKED ON WERE THE SHIFTER HAS DONE THIS AND IT WAS DUE TO THE PEOPLE WHO OWED THIS CAR BEFORE THEM THATS DROP THERE MONEY LIKE CHANGE DOWN IN THERE OR IT COULD BE FROM DIRT TRASH OR GETTING DOWN THERE JAMMING THE SHIFTER GEARS AND MAKING THEM NOT WORK WRIGHT NOW IT IS NOT UNLIKEY THAT THE CABLE MIGHT BE JUST WORN OR STREHCED THEN IT NEEDS REPLACED PLEASE CHECK OUT THESE SOLUTIONS BEFORE REPLACING THE SHIFTER CABLE

You need to check the linkage. Under the car, the section that connects the gear shift stick to the transmission rods.

there is a safety device that prevents putting the gear shift in park without the brakes pressed(saves park in your transmission so it isnt stripped accidently) it could be broke

Are you parked on a slope of any kind ? If so, have someone rock the car backward & forward a bit, while you try to get it out of park.