Yesterday the trunk on my 2005 Nissan Sentra would open with a key but not with the trunk release on the dash. Now the key will not even work - goes in but will not turn. How can I get the trunk open?

Hi, I'm not sure, but check and see if the back seats lay down. That if you can get inside the car of course.

may be manual release behind or under back seat and if not you may need to remove back seat and panal which should let you into trunk. once in there should be a release on the trunk inside to open it. most new cars have them to prevent someone from getting locked in trunk. after opened you may want to have lock system replaced or it could simply just need oiled....... hope this helps and good luck

check in your glove box on left hand side.valet switch may have accidentally set.let me know how you make out!

this is strange. is there access to the trunk from the rear seat? if not the rear seat will need to be removed to get to the trunk and then there will be a pull ring that releases the trunk latch. it is a safety requirement on all cars to let someone get out of the trunk

you have to remove the bottom part of the seat and then un bolt the upper part

Stick red nozzle of WD-40 in as far as you can in key hole & give a good spray, and give it a few minutes to start working then try key fob or key itself, or both at same time.. May take a few tries but you might get lucky. When/if you do get it open, spray back of that latch good with WD-40, then give it a few days & spray it with white lithium grease to help prevent same thing again in future.

fold down back seat and manually release the latch them inspect lock for trunk

Sounds like the trunk latch actuator is out.

check the hatch adjustment on the trunk when it is open. This may be causing the auto pop feature for your keyless and your trunk pop on your dash to the left of your steering wheel to not work. But your key should still be able to open it

inside the trunk near the latch is a switch that kills the trunk remote