How do I change ignition coil wires on a 2003 nissan altima

SOURCE: 2003 Nissan Altima?

Where is the sensor placed on the car?

SOURCE: 99 nissan altima 4dr. key will not turn ignition

sometimes if the steering wheel is in a bind the switch will not turn try turning the wheel a bit while at the same time turning the switch good luck

SOURCE: nissan altima 2003 how to change engine belt

TO REPLACE DRIVE BELT YOU LOOSEN DRIVE BELT ADJUSTMENT BOLT SLIP THE BELT OFF THE CRANKSHAFT PULLEY AND REMOVE IT. IF YOU GOT A 2.5L ENGINE YOU HAVE TO ROTATE THE BELT TENSIONER TO RELEASE TENSION ON THE SERPENTINE DRIVEBELT.YOU NEED A HAYNES MANUAL.IT WILL SHOW AND TELL YOU HOW TO ADJUST DRIVE BELT AND MEASURE THE DRIVE BELT DEFLECTION USING A STRAIGHT EDGE RULER.

SOURCE: crankshaft and camshaft sensors location in nissan altima 2003

You are incorrect sir. There is a very good Youtube video showing you exactly where it is that is how I changed mine. The Crankshaft is located behind the engine block below and around from the cam sensor which is easly spotted looking at the engine. The crankshaft is in a difficult spot but once you figure out where it is it's easy...ish hope this helps

SOURCE: 2003 nissan altima

First of all, you'll have to clarify which belt it is you're talking about. Is it a SERPENTINE drive belt or a Timing belt? Two totally different belts.
If its a timing belt, you're in luck as Nissan Altimas have timing chains on the engines which shouldn't need replacing for at the very least 100,000 miles. If you're talking about the serpentine drive belt on the other hand, there's really only one way it can go over the pulleys. One side of the belt it grooved, and one side is smooth. There's only one way it can go over all of the pulleys while having the grooved face sitting on grooved pulley surfaces,... should be really easy to figure out.