2001 Nissan Altima Problems: 1 Issues Every Owner Should Know
2001 model year · 0+ owner reports · Updated April 2026
According to Au7o's analysis of 0+ owner reports, the 2001 Nissan Altima has 1 documented known issues, with 1 rated critical. The most serious is Rusting Front Floorboards and Underbody Corrosion Near the Firewall/Subframe Area ($500-$3,000 repair). Across all issues, repair costs range from $500 to $3,000. DIY maintenance guides at au7o.io.
All 1 Known Issues
On the 2000-2006 Nissan Altima, older Altimas in rust-belt climates are known for severe floorboard and underbody corrosion, especially around the front floor pan, firewall seams, and nearby structural mounting areas. Owners report soft floors, water intrusion, failed inspections, and concerns about structural integrity around suspension or subframe attachment points. The issue is most common on early-2000s cars that saw repeated winter salt exposure.
Common Symptoms
- soft floorboards
- visible rust holes under car
- water on front carpet
- musty interior smell
- failed safety inspection
- subframe area corrosion
How to Fix
Inspection should include lifting carpets, probing floor pan seams, and checking the subframe and adjacent mounting points for perforation. Minor corrosion can sometimes be cut out and welded with rust treatment, but advanced structural rust often makes the vehicle uneconomical to repair. Keeping drains clear and addressing windshield or cowl leaks can slow recurrence after repair.
What Owners Are Using
Parts and tips from 0+ owners who fixed this issue
- TipPull the front carpet and inspect from inside as well as underneath; several owners found much worse rust hidden by sound deadening and wet carpet.
- TipIf buying an early-2000s Altima in a salt state, inspect the floor pan and subframe before spending money on engine or transmission work.
- UpgradeAfter rust repair, owners often use a cavity wax or rust inhibitor inside seams to slow future corrosion. (Fluid Film Rust and Corrosion Protection)
- UpgradeA rust converter is commonly used on surface corrosion before sealing repaired areas. (POR-15 Rust Preventive Coating)