My 2002 Maxima GLE wont go in Reverse. When I place in Reverse the engine revs but the car does not move. The car has lost power while in Drive and the RPM's will not exceed 3,000 RPM. Does this mean I need a new Transmission..???

It could be as simple as a shift solenoid but you need to have the transmission checked. It can be diagnosed for about 90 bucks and well worth finding it now then later.

Sounds like the revolution sensor. There are more than one if I read correctly on that Maxima and could cost about 800bux to fix.

Need transmission repair. Sorry.

idle air control motor failure be carefull this can cause ecm damage if left un treated

Check your air horn (big rubber boot) to the throttle body. It may have a crack on the underside and when you put it in drive and the engine torques to that side the crack opens and causes it to die.

start witha new fuel filter and perhaps a intank additive such as heat. also look inside the air box for nests. also common. if all is clear, let it run and idle for about 10-15 minutes look underneath the vehicle and look to see if anything under there is cherry red. if not try holding the accelerator down for a few momoents and check again. if it glows, replace the catalytic converter.

its mostlikly a safety nothing to be concerned about

Sad to say but your automatic transmission has bit the dust.

for the 2003 it sounds like maybe the tranny cooler is getting clogged.

Get your transmission position sensor checked. With it being an automatic it doesnt have a clutch