pleaseee help... 2 days ago I open the trunk with my remote and since then my remote stopped working I changed the battery I was trying to reprogram my key but no luck please someone help!!! and also tried a new key and this one failed. Mazda rx8 2003 6speed

 

Usually it's the keyfob that goes bad.
I had the same problem.
A switchblade key fob fixed mine.
You have to have the right model and FCC number.
Lots of info in this thread;

 

i tried a new one but no luck..

 

i tried a new one but no luck!!!

 

Did you read that thread?
Did you get a new switchblade fob woth the correct Model and FCC numbers?