What is this code po443 for and how do i fix it

EVAP Purge Control Circuit

http://www.autocodes.com/p0443_ford.html

Try a new gas cap, that is usually the culprit. Around $20 on up for keyed at any part store. And easy to put on.

code p0443 refers to EVAP canister purge valve--circuit malfunction===causes --wiring---EVAP canister purge valve--ECM

code p0451 refers to EVAP pressure sensor --range/performance problem===causes --EVAP pressure sensor

code p0135 refers to heated oxygen sensor(HO2S) 1 bank 1 heater control --circuit malfunction===causes --fuse--wiring--HO2S ---ecm

basically the HO2S sensor is not stable and altering the air/fuel mixture settings for the ECM and this is not being helped by a faulty EVAP purge valve and pressure sensor.

2008 Nissan frontier code po443 what doesit m aen on tell how to fix it how dow I find on the truck thanks

P0443,look at the evap control system pressure sensor,or the evap canister purge volume volume solinoid valve[the valve is stock open]hoses,,maybe the hoses are connected incorrectly..

po 443= purge solenoid circuit
po 730= incorrect gear ratio, transmission problem
po 751= 1/2 solenoid problem
po 756= 2/3 solenoid problem
other 2 have no listing on alldata
you should seek professional help with these trans codes.
check ALL fuses first

check the vacume lines

That code is for the Evaporative Emissions. It could be a bad Evaporative Emissions Canister Valve or just a bad vacuum line or my granddaughter's 1997 Ford Escort had that code and her gas cap was NOT on. Now when you figure out what one it is disconnect the battery for 10 minutes to reset the computer.

Evaporative emission control system purge control valve circuit. po443

To cause a P0443, there has to be a problem with the purge control CIRCUIT, not necessarily the valve. Usually they are a unit housing the valve and the solenoid as an assembly. Or it could be comprised of a separate solenoid with vacuum lines to a purge valve. That said, it could be any of the following:

• Bad purge solenoid (internal short or open)
• Wiring harness chafing or rubbing another component causing short or open on control circuit
• Connector worn, broken or shorted due to water intrusion
• Driver circuit inside powertrain control module (PCM) is bad

I would just clear out the code and if it returns then try the above. Hope this helps you a little bit!

Sincerely,

JC