Check engine come on code po446 hoow u that? - 1996 Nissan Maxima

You have an Evap System problem and yes, this can cause poor gas mileage. Possible causes are:

• Plugged vapor canister
• Faulty vent solenoid
• Pinched or blocked EVAP hose
• Faulty FTP sensor

YOU REPLACED PARTS FOR NOTHING ! P0446 Chevrolet Evaporative Emission Vent System Performance Chevy Impala Check Engine Light Codes P0446 P0451 EVAP Trouble HERE WATCH A REAL TECH.

po320
Faulty Ignition/Distributor engine speed sensor, Faulty Crankshaft Position sensor
Ignition/Distributor engine speed sensor harness is open or shorted, Ignition/Distributor engine speed sensor circuit poor electrical connection, Low battery charge, Faulty Engine Control Module (ECM)
po446
try tightening the fuel cap if not replace it

need more info if high mileage on original fuel pump check pressure because if pump is not pumping enough fuel it will not open fuel pressure regulator and will give you same issue

po446 is a evap code wont effect the way it runs!!!

www.engine-light-help.com/generic-check-engine-light-codes.html

PO446 EVAP System Vent Control Circuit Malfunction

po305 is related to missfire on #5 cylinder
po440 is related to fuel tank pressure
pO441 is for evaporator purge flow malfunction
po446 relates to vent control valve electrical circuit malfunction

missfire is seperate from the other codes
as for the other three codes replace the vent control valve solenoid located near the charcoal canister the oth3er codes can relate to a faulty solenoid

after replacing light will only go out if you clear through a scan tool or three drive cycles of over 10 min each

2001 camry code po440,po441,po446
what kind of problem and how can be solved
sam

p0446 is an evap code for incorrect purge flow, check the rear vacume switching valve. its above the rear sub frame

if the air filter was recently inspected or changed, look for the vacuum hose to be disconnected from the valve located on the air filter cover. another source may be the gas cap either loose or with the tether strap caught under it preventing a proper seal