I've got a 96 Maxima. The car hasn't been running quite as good lately. It dosn't have as much power and gets worse gas mileage than I used to get. I had the codes ran and these are what came up:

• P0505: Idle Control System Malfunction
• P0325: Knock Sensor 1 Circuit Malfunction
• P0440: Evaporative Emission Control System Malfunction
• P0446: Evaporative Emission Control System Vent Control Malfunction

I had the knock sensor replaced which helped with the power and mileage, but it still is lacking. After replacing the knock sensor, the car idles around 1000-1300 rpm. What do these other codes mean? What is needed to fix them? Thanks.

 

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In the FAQ

http://forums.maxima.org/showthread.php?t=104931

 

Maybe this will help:

http://members.dslextreme.com/users/maxima/esm/