Have a 2003 Spectra can't shift into 2 gear or back to 1st

SOURCE: 2003 nissan altima 2.5s transmission rough shift

Probably sensors! I have already replaced the crankshaft positioning sensor once, nissan replaced it once under recall and now it is bad again! Plus my speed sensor is bad too! Go to any part store and get diagnostic test ran, it will tell what sensors are bad.

SOURCE: cannot shift into reverse although forward gears all functional

have ur shift linkage bushings replaced....most likely thse are torn or completely broken .. this is common on these models..also on some vw's of the same years

SOURCE: won't shift out of 1st gear

Replace the output speed sensor on the front of the tranny. It has two wires going to it. ANd looks like a round plug with a bolt like base on it. It is also white.

SOURCE: Trouble shifting gears. Gears grinding while

YOU NEED TO TAKE YOUR TRANS OUT AND HAVE IT REBUILT, THE SYNCHROS ARE WORN OUT!!
THAT IS WHY YOU HAVE TROUBLE SHIFTING GEARS!!

SOURCE: Hummer H3 Losing power when shifting from 1st to 2nd gear.

as odd as this may sound, try replacing the fuel filter.