Well when I first bought this car, it was a sweet deal. It has a brand new motor with 500 miles, I have replaced both cats, all four fuel injections, on its 2nd set of tires, new struts all the way around, brakes were bad, had one two recalls for the subframe and the ECM sensor, rusty floor pans replaced.
This car I thought was a good deal from surviving a car exploding in my other Altima - can provide pictures as proof.
This car, as I was not aware, has the precat engine issue, so before the precat thinks it's gonna go bad on me, I went ahead and put a racing header and a different exhaust system, as I cannot afford to replace cars every year.
When I first got this thing, the fuel injectors went bad. Lucky this still had the 100k warranty, so 1500.00 a piece at Nissan's expense was fine with me.
I've had to get the butterfly screws replaced, as Nissan won't tell you they will come loose and fall into the cylinders, and will score the walls.
I have yet to replace the 2nd motor, just been watching the oil closely.
Nissan will also fail to tell you about your 2002 Altima, with the rusty floors. I found out the hard way when my foot went through the pan to the ground when I was traveling at speeds of 75mph. It's a common issue from research I've done with the models 02-05, but some people may not know about this issue till it's too late, and Nissan will say it's something they have never heard of.
If I was you, stay away from this car! Buy a Honda or something, I'm surprised at 125,800 miles I haven't had to get the motor replaced once again for oil cat issues. I really wished I would have bought this Honda hybrid I found. It was a bit more, but wouldn't have had issues like these.