93 maxima starts in park but stops in reverse

1. If you parked it 6 months ago there is a chance you;have chewed on wiring if it's outside by a field.
2. make sure fuses are good, i know but (check anyway)
3. does it have sufficient fuel to start ???
4. if you parked the car with very low fuel left in tank , you may have a corroded fuel pump (internal tank pump)"trust me when i tell you this can happen"
5. make sure no one played any tricks on ya under the hood !!!, good luck

Check all the connections on the ECM especially the ground wires. When the vehicle is put into gear, the ECM starts looking for the sensors, if the ground is bad, the ECM pulls ground current through the sensors. Then check the sensors.

The Reverse Lt. Switch is out of adjustment.

Bad PRNDL switch(park/reverse/neutral/drive/low).May be adjustable,but most likely the switch is bad.As a temporary/free solution,try starting in Neutral(USE YOUR PARKING BRAKE!)

Heat Shield is loose - it's flopping around. Sounds like an engine issue, but it's not.

I had the same problem on a '93 Altima & again on my 2003 Maxima a few months ago. A local garage fixed it for free both times. For the Altima, he just removed the shield. He advised that I do not park on high, dry grass as contact with the grass might start a fire (around here, cars are usually on pavement all the time - the grass thing was not an issue - and, there were no fires). On the 2003 Maxima, the garage was able to replace the rusted out clamp using some scrap material they had lying around. The heat shield was resecured into position. No more pinging.

I had Nissan take a look at the 2003 Maxima repair afterwards. They said the garage did a nice job.

you have to step on the brake to shift to reverse or park from drive

if it won't engage reverse the trans will need to be overhauled, the rev clutch has failed inside the trans.

sometimes stuff falls down into the cracks where the lever is, so try that. but there is, inside of the console that the lever is on, a cable that wraps around a little plastic roller, and it has gears on it that make it click into Park, or Reverse, or 1,2, OD, whatever. sometimes if those get worn out, the little plastic part will get stuck into park, because it is supposed to lock into park, and you have safety switches in there too so that you cant shift from park without pressing on the brake. so check and see if it is the cable, the check the plastic part, i think it should be green.

shift linkage needs adjusting,,could be bent, easy fix, located along firewall to fram beneath the column, ask your son wut he ran over and didnt tell u about... hope i could help...:)

neutral safety switch...the linkage isnt allowing it to fully be placced in park so the signal is acting like it is in reverse, it is in the collumn