my 2001 gxe automatic maxima needs an engine harness. can i use a 2003 engine harness?
can i use a 2003 maxima part on a 2001 maxima on 2001 Nissan Maxima
That's a tough one. If you have a part number, it's worth a call to your local Nissan dealership parts department. You could ask them to look up your car by VIN and see if they can tell you that they part you are looking at will work.
I would doubt if you could use a wiring harness from a car two years newer. The dealer orders harness by VIN number. Even small differences will rewiring the engine compartment a nightmare. Look on line I am sure you will find a harness for your exact year and model.