Does anyone know codes PO440 and PO446?

[lcmb25]

I just bought a 1997 Maxima about a month ago and love it. I had my engine light come on and the codes are PO 440 and PO 446. Can anyone please help me. I am also looking at putting on a cold airintake and any info on those would be awesome

[Blackwind 98 SE]

whats your location?

[lcmb25]

Utah. Can you help me??

[havic]

I know you posted a long time ago but if this helps
Diagnostic Trouble Code Description
--------------------------------------------------------------------------------

Trouble Code: P0440
Vehicle Qualification: Nissan Maxima
Description: Evaporative Emission Control System

Trouble Code: P0446
Vehicle Qualification: Nissan Maxima
Description: Evaporative Emission Control System Vent Control Circuit

[johnnyproduce]

Originally Posted by havic

I know you posted a long time ago but if this helps
Diagnostic Trouble Code Description
--------------------------------------------------------------------------------

Trouble Code: P0440
Vehicle Qualification: Nissan Maxima
Description: Evaporative Emission Control System

Trouble Code: P0446
Vehicle Qualification: Nissan Maxima
Description: Evaporative Emission Control System Vent Control Circuit

Hi, I understand that much but what do I have to do to fix the problem??

[habenero2002]

most of the time replacing the vent control valve on the canister will correct this problem

[mrpreludesh]

Also try changing your gas cap

[johnnyproduce]

OK, I fixed the 446 code by replacing the evap cut valve, located on the charcoal canister. It's the part opposite the muffler previously mentioned in the thread. NOW, I replaced the gas cap and replaced my purge control valve and 440 keeps coming up HHHHHEEEELLLLPPPP!!!!!!!!

[trv_2000]

Originally Posted by johnnyproduce

OK, I fixed the 446 code by replacing the evap cut valve, located on the charcoal canister. It's the part opposite the muffler previously mentioned in the thread. NOW, I replaced the gas cap and replaced my purge control valve and 440 keeps coming up HHHHHEEEELLLLPPPP!!!!!!!!

Where is the purge control valve and is it easy enough to be replaced by novice like me?

[johnnyproduce]

Originally Posted by trv_2000

Where is the purge control valve and is it easy enough to be replaced by novice like me?

The purge control valve is under the hood of the car. It's really easy to find bc it's on the top of the engine just open it up and look around you can't miss it!!