Not necessarily a catalytic issue. I have a 2000 Sentra that set off the same code. I replaced the catalytic, which set me back a ways (California emissions added to the cost!), and within a week, the same code went off. After doing some research, Im going to check into the secondary O2 sensors on the up and downstream of the catalytic (both O2 sensors found in my engine bay have already been replaced so I kind of narrowed it down to the remaining 2). As the catalytic is brand new and there are no exhaust leaks, I am forced to conclude that this is my problem. My suggestion is to have your sensors checked before dropping $600 like I did. If they have the tools, they can test individual sensors without replacing them which could save you $120-$165 per sensor by just guessing. Good luck!
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there is a emission system recall for these codes for your year and model contact the Nissan dealer, it is a no charge repair.
here is the summary of that recall
MALFUNCTION INDICATOR LAMP ON WITH DIAGNOSTIC TROUBLE CODE P0300-P0306, P1273 OR P1283. *TT *SC Make : NISSAN Model : QUEST Year : 2004 Manufacturer : NISSAN NORTH AMERICA, INC. Service Bulletin Number : 04028A Date of Bulletin : MAR 24, 2004 NHTSA Item Number : 10005976 Component : ELECTRICAL SYSTEM Summary : MALFUNCTION INDICATOR LAMP ON WITH DIAGNOSTIC TROUBLE CODE P1031, P1051, P1148, P1168 (A/F SENSOR HEATER / CLOSED LOOP) ON 5 SPEED AUTOMATIC TRANSMISSIONS ONLY. (THIS VERSION SUPERSEDES NTB04-028.) *TT