Carl Carlson 
2002 Nissan Altima Sedan 3.5 SE 4dr Sedan (3.5L 6cyl 5M)
Manufactuing defect.
 My wife and I really enjoyed our Altima, we had 92000 on it and planed on another 100000.  But to our dismay we found that the passenger floor board had nearly completely rusted out, shades of the 50s. It was so bad that when you put your hand on it it felt like a sponge.  The dealer and the company did not care about this and would do noting that had to be a manufacturing defect.  We will never buy another car from that dealer or company.  We have bought a 2009 Mazda6 and love it.