roushfan5 
2002 Nissan Altima Sedan 3.5 SE 4dr Sedan (3.5L 6cyl 4A)
Awesome car
 A lot of people are complaining about their cam shaft sensors. Well my check engine light came on for the exact same problem. Turned out I was just using the wrong type of oil. Make sure you are using 5-30W oil to avoid this problem. After a couple hundred miles with the correct oil in the car the problem went away. Our car is the V6 with a 152,400 miles on it and to date the only problem we've had to fix is replace the seals in the engine, oil cooler and the rear value gasket. The interior is a little cheap I'll admit. But the car def. makes up for it with that fantastic engine. A great car but it has to be maintained