Don't buy one 
2003 Nissan Altima Sedan 2.5 S 4dr Sedan (2.5L 4cyl 5M)
catalitic converter problems
 Nice car when I first bought it. Larger than toyota. But, at 50,000 miles check engine light, had to spend 800 on a new catalytic converter, then at 90,000 crank position sensor, failed several times before the dealer figured it out. Now check engine light again. Who knows what now. Buy a honda, much more reliable. 