One problem related to o2 sensor has been reported for the 2005 Nissan Altima. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 Nissan Altima based on all problems reported for the 2005 Altima.
I already went though p0420 issue few years back and I got it again. Nissan dealer charged me whole lotta money to fix the issue and the warning sign came back again. Went to local auto zone and it show p0420 again. Please help. I read so many articles online and it turns out all Altima has this issue (crankshaft, O2 sensor, etc. ).