Just got through spending $2100 on timing tensioner issue along with the 3rd crank sensor in the last 4 years. I had an oil change last week and the servicer noted that the flooring was rusting through under the drivers side floorboard. He could see flooring material coming through the rusted out spot.

I've been an Altima user for about twenty years. This 2006 model which has about 108,000 miles on it is the only one I've ever had significant problems with. These issues mentioned are apparently common with this model of Altima. They should make it right! I expect it won't be cheap to fix the flooring!

I may be looking a Honda, Toyota or Hyundai for a replacement vehicle.

Vehicle was purchased new original owner, vehicle was maintained as per manufacturers recommendations. Vehicle was not undercoated. From what I have read I don't believe this would have made a difference. Floorboards rusted out on the left and right sides. The perforated type rust on both sides about 12 to 14 inches wide and over 24 and 26 inches in length. The right quarter panel inner lip also rust out about 2 to 3 inches. Vehicle has always been in a garage (vehicle located in Wisconsin). We still have the vehicle, will most likely fix this the spring and sell it. We would have bought another Nissan, but not with this going on from what I have read Nissan will not stand behind this problem or compensate in any form. My girl friend at the same time bought this Altima and a Murano for her daughter. Nissan has lost us as customers. We have recently bought a new 2015 Ford Escape to replace the Altima. I feel there should be a 'class action' lawsuit brought against Nissan for the problem with the Altima.

FOUND RUSTED HOLE IN FLOOR PANEL UNDER DRIVER SEAT THE SIZE OF MY HAND. WENT TO BODY SHOP AND FIXES RANGE FROM $800-1500. PATCHING THE HOLE WITH A RIVETED STEEL PANEL TO REPLACING THE ENTIRE FLOOR PANEL. BODY SHOP SAID THE PROBLEM IS COMMON TO THIS MODEL. I WENT TO MY MECHANIC. HE HAD ALREADY FIXED TWO OTHER 2006 ALTIMAS WITH THIS PROBLEM BY TEARING OUT SEAT AND ADDING STEEL. HE CAN'T BELIEVE THERE HASN'T BEEN A RECALL. THERE IS NOT A SPECK OF RUST ANYWHERE ELSE. I'M SO DISAPPOINTED IN NISSAN!

Update from May 13, 2015: Got a few estimates from body shops and my mechanic. I even found an aftermatket fix. I finally settled on having my mechanic put in sheet metal....$800.

You will find my other complaint under head gasket. Had a mechanic replace the head gasket and he said to me, "did you know you have holes on driver/passenger side in the floor board? Considering I have had numerous things done to the car over the last 2 years (suspension and lower control arm replaced) you would think my mechanic might have mentioned I have holes/rust in the floor boards.....Wow. so I just spent $1100.00 replacing the gasket and timing chain thinking I could get another year or 2 out of the car and now this.

I purchased this car in 2007 and within the last year my floors are rusting out and I can put my foot through it. I called Nissan and they said they couldn't do anything for me because there was no recall on the vehicle. Winter is coming and I do not have $600 to put into it to fix the problem. When reading all of the comments and complaints on many sites, everyone seems to be having this problem. If thousands of people are having this problem, why has this not been recalled yet? I would never buy another Nissan again.

This problem surprises me. The is not one speck of corrosion on the vehicle. It has been well-maintained, undercoated and rust-proofed for the past few years. The vehicle is kept inside when not in use. Nissan warranties against the problem for 6 years only without consideration of any care and attention by the owner - that just feels wrong. Even my 1988 Ford T-bird (retired in 2006) kept rust-free longer and it was parked outside most of the time! I think Nissan should spring for the repairs in this case.